Correspondence to or from:

• I Confess, New York, N.Y. (1926)
• Ideal Publishing Corp., New York, N.Y. (1943)
• Idlewild Turkey Ranch, Whittemore, Mich. (1936)
• Illinois Book Exchange, Chicago, Ill. (1909)
• Illinois Central System, Chicago, Ill. (1921-1936)
• Illinois Farmer and Farmer's Guide, Quincy, Ill. (1918)
• Illinois Guardsman, Chicago, Ill. (1937)
• Illinois Motorist, Chicago, Ill. (1930)
• Illinois State-Journal, Springfield, Ill. (1915)
• Illinois State Register, Springfield, Ill. (1917)
• Illustrated Campanion, New York, N.Y. (1918-1919)
• Illustrated Detective Magazine, New York, N.Y. (1931-1932)
• Illustrated Home Sewing Magazine, New York, N.Y. (1931)
• Illustrated Love Magazine, New York, N.Y. (1931-1933)
• Illustrated News, Los Angeles, Calif. (1933)
• Illustrated Daily News, New York, N.Y. (1919)
• Illustrated News Mirror, Toronto, Ont. (1923)
• Illustrated World, Chicago, Ill. (1922-1923)
• Imperial Press, Sugar Land, Tex. (1928)
• Independent, Kansas City, Mo. (1929)
• Independent, Lowry City, Mo. (1914)
• Independent Pressroom, Minneapolis, Minn. (1932)
• Independent Salesman, Cincinnati, Ohio. (1927)
• Independent Woman, New York, N.Y. (1931)
• Indiana Catholic & Record, Indianapolis, Ind. (1930)
• Indiana Farmer, Indianapolis, Ind. (1914)
• Indianapolis Times, Indianapolis, Ind. (1918)
• Industrial Banker, Chicago, Ill. (1923)
• Insdustrial Distributor & Salesman, Chicago, Ill. (1928)
• Industrial Dixie, Dallas, Tex. (1928)
• Industrial Executive, New York, N.Y. (1928)
• Industrial Pioneer, Chicago, Ill. (1923)
• Industrial Power, Chicago, Ill. (1927)
• Industrial Record, Chicago, Ill. (1930)
• Infantry Journal, Washington, D.C. (1931)
• Information, A Digest of Current Events, New York, N.Y. (1915)
• Inland Poultry Journal, Indianapolis, Ind. (1932)
• Inland Printer, Chicago, Ill. (1915-1930)
• Inland Topics, Chicago, Ill. (1934-1936)
• Institutional Jobber, New York, N.Y. (1929)
• Instructor, Rochester, N.Y. (1933)
• Insurance Bulletin, San Francisco, Calif. (1927)
• Insurance Field, Louisville, Ky. (1927-1928)
• Insurance Register, Philadelphia, Pa. (1927)
• Insurance Salesman, Indianapolis, Ind. (1927)
• Interlaken Mills, Providence, R.I. (1918)
• The International, New York, N.Y. (1912)
• International Correspondence Schools, Scranton, Pa. (1929-1931)
• International Feature Services, New York, N.Y. (1922)
• International News Service, New York, N.Y. (1913)
• International Nickel Co. of Canada, Copper Cliff, Ont. (1936)
• International Publishing Company, Chicago, Ill. (1934)
• International Railway Co., Buffalo, N.Y. (1927)
• International Railway Journal, Philadelphia, Pa. (1913)
• International Syndicate, Baltimore, Md. (1931-1933)
• International Trade Papers, Inc., New York, N.Y. (1928)
• Investment Banking, Chicago, Ill. (1931)
• Interurban Magazine, Chicago, Ill. (1916)
• Iowa City Daily Press, Iowa City, Iowa. (1915)
• Iowa Guardsman, Des Moines, Iowa. (1937)
• Iowa Homestead, Des Moines, Iowa. (1918-1929)
• Iron Age, Chicago, Ill. (1912)
• Irving-Cloud Publishing Co., Chicago, Ill. (1927)
• Islander Magazine, Staten Island, N.Y. (1928)

Correspondence to or from:

• Jackson, Fred, New York, N.Y. (1917-1918)
• Jackson, G.A., Boston, Mass. (1914)
• Jackson, Hall N., Cincinnati, Ohio. (1915)
• Jackson, Margaret Weymouth, Spencer, Ind. (1937-1941)
• Jackson Citizen Patriot, Jackson, Mich. (1919)
• Jacksonville Metropolis, Jacksonville, Fla. (1917)
• Jacksonville News, Jacksonville, Fla. (1913)
• Jacksonville Times-Union, Jacksonville, Fla. (1917-1918)
• Jacobsen Publishing Company Inc., New York, N.Y. (1931)
• Jahn & Ollier Engraving Co., Chicago, Ill. (1915)
• Jahnke, William A., Yongstown, [Ohio]. ([19--])
• Jameson, Helen F., Chicago, Ill. (1915)
• Jamkowski, T. Books, Detroit, Mich. (1946)
• Jansson Brothers Company, Chicago, Ill. (1918)
• Janvier, Meredith, Baltimore, Md. (1925)
• Jarvie, Robert R., Evanston, Ill. (1936)
• Jasper, Thomas, Chicago, Ill. (1914)
• Jeffersonian, Chicago, Ill. (1922)
• Jenkins, Charles Christopher, Toronto, Ont. (1924)
• Jenks, Tudor, Bronxville, N.Y. (1917)
• Jepson, Edgar, London, England. (1936)
• Jerger, F., Martins Ferry, Ohio. (1916)
• Jillson, Frank A., Providence, R.I. (1945-1946)
• Johnson, Brevet, Elkhorn, Wis. (1936)
• Johnson, Burges, Poughkeepsie, N.Y. (1921)
• Johnson, Dorothy, Chicago, Ill. (1946)
• Johnson, E.W., New York, N.Y. (1917)
• Johnson, Martyn, Los Angeles, Calif. (1920)
• Johnson, O.S., Salt Lake City, Utah. (1947)
• Johnson, Ryerson, Toronto, Ont. (1942)
• Johnson, W.E., Westerville, Ohio. (1913-1915)
• Johnson's Bookstore, Springfield, Mass. (1917-1918)
• Johnson's Fish Market, Long Island, N.Y. (1936)
• Johnston, Charles, Bergensfield, N.J. (1914)
• Jones, D.A., Lakewood, Ohio (1931)
• Jones, Edward Lee, Richmond, Va. (1948)
• Jones, Francis Arthur, New York, N.Y. (1923)
• Jones, Nard, Bellevue, Wash. (1941)
• Josephinum Weekly, Columbus, Ohio. (1930-1931)
• Josselyn, Talbert, New York, N.Y. (1944)
• Journal of American Commerce, Chicago, Ill. (1920-1921)
• Joyce, James, Zurich. (1919)
• Judd, Edward P. Company, New Haven, Conn. (1923)
• Judy, Will Publications, Chicago, Ill. (1944)
• Judy Publishing Company, Chicago, Ill. (1927)
• Juergens & Andersen Company, Chicago, Ill. (1916-1917)
• Junior Home Magazine, Chicago, Ill. (1923-1930)
• Junior Safety Patrol, Chicago, Ill. (1931)
• Junior Yanks, Chicago, Ill. (1919)
• Juvenile Journal, Minneapolis, Minn. (1912)

Correspondence to or from:

• Ladies Home Economics, Kansas City, Kan. (1929)
• Lafave, Arthur J., Cleveland, Ohio. (1937)
• Lafayette-South Side Bank & Trust Co., St. Louis, Mo. (1929)
• Laird & Lee, Chicago, Ill. (1914-1930)
• Lake Publishing Company, Baltimore, Md. (1910)
• Lamb, A Magazine of Fun and Finance, New York, N.Y. (1916)
• Lamb Publishing Company, New York, N.Y. (1916-1917)
• Lambert Publishing Company, Chicago, Ill. (1925)
• The Lamp, Peekskill, N.Y. (1926-1939)
• Landau, Jane, Chicago, Ill. (1929)
• Lane, Jeremy, New York, N.Y. (1922)
• Lane, R.E., Oak Park, Ill. (1930)
• La Patrie, Montreal, Que. (1933-1934)
• Lares and Penates, Philadelphia, Pa. (1924)
• Larrimore, Lida, Devon, Pa. (1932)
• La Salette, Altamont, N.Y. (1938)
• Lasalle Extension University, Chicago, Ill. (1927)
• Lathrop, G.A., Gunnison, Colo. (1937)
• Lauderdale Lakes Improvement Association, Chicago, Ill. (1919)
• Lauffer, Berthold, Chicago, Ill. (1933)
• Laughter, Philadelphia, Pa. (1926)
• Laurentian Publishers, Chicago, Ill. (1914)
• Lavenson, Jay, Philadelphia, Pa. (1930)
• Lea, Constance N., West Hill, Ont. (1934)
• Lea, Fannie Heaslip, New York, N.Y. (1930)
• Lean, George A., Elkhorn, Wis. (1936)
• Leather Progress, New York, N.Y. (1928)
• Leblanc, Esthele, St. Hyacinth, Que. (1934)
• Lee, Helen A., Cambridge, Wis. (1934-1935)
• Lee, Jennette, Northampton, Mass. (1936-1937)
• Lee, Reuel P., Minneapolis, Minn. (1933)
• Lefax Incorporated, Philadelphia, Pa. (1927)
• Le Gallienne, Richard, Menton, France. (1936)
• Lehner, Adolph P., Oconto Falls, Wis. (1929)
• Leicht, Dorothy, Winona, Minn. (1933-1935)
• Leichton, W.R., Fayetteville, Ark. (1916)
• Leighton Industries Inc., San Francisco, Calif. (1927-1928)
• Lenart, Elta, Chicago, Ill. (1928)
• Lenhart, Ralph L., York, Pa. (1930)
• Lenniger, August, New York, N.Y. (1934-1935)
• Lescarboura, Austin C., New York, N.Y. (1928)
• Leuin, M.L. & Company, Pittsburgh, Pa. (1934)
• Levant Literary Agency, Jerusalem. (1936)
• Levy, Robert, New York, N.Y. (1937)
• Leward, Elsie Singmaster, Gettysburg, Pa. (1931-1934)
• Lewis, E. St. Elmo, Detroit, Mich. (1931)
• Lewis, James Hamilton, Washington, D.C. (1933)
• Lewis, Margaret Cameron, New York, N.Y. (1920-1930)
• Lewis, Tracy H., New York, N.Y. (1926)
• Lewis, William Eugene, New York, N.Y. (1926)
• Lewis Publishing Company, St. Louis, Mo. (1909-1910)

Correspondence to or from:

• Libertarian, Greenville, N.C. (1925-1930)
• Library Clearninghouse, Chicago, Ill. (1913)
• Library Journal, New York, N.Y. (1935)
• Life and Health, Washington, D.C. (1932)
• Life Association News, New York, N.Y. (1927)
• Light and Life Sunday School Publications, Chicago, Ill. (1932)
• Lighting, Inc., Chicago, Ill. (1929)
• Lighton, William R., Fayetteville, Ark. (1916)
• Lilius, Aleko E., Manila, P.I. (1931)
• Lilly, Eli & Company, Indianapolis, Ind. (1936)
• Limelight, Palm Springs, Calif. (1935)
• Lincoln, Joseph C., Villa Nova, Pa. (1920-1936)
• Lincoln Motor Co., Detroit, Mich. (1927)
• Lincoln National Life Inc. Co., Fort Wayne, Ind. (1928)
• Lindlahrs Magazine, New York, N.Y. (1930)
• Lindquist, H.L., New York, N.Y. (1935)
• Lindsay, Vachel, Springfield, Ill. (1930)
• Lionel Magazine, New York, N.Y. (1930-1938)
• Lions Club Magazine, Chicago, Ill. (1924)
• Liotta, Josephine, New York, N.Y. (1938)
• Lippincott's Magazine, New York, N.Y. (1914)
• Literary Agency of London, London, England. (1911-1915)
• Literary Associates, Inc., Philadelphia, Pa. (1932)
• Literary Business of James Knapp Reeve, Franklin, Ohio. (1928)
• Literary Features International Syndicate, New York, N.Y. (1937)
• Literary Features, Ltd., London, England. (1937)
• Literary Florida, Tampa, Fla. (1939)
• Literary Year Books Press, Liverpool, England. (1927)
• Litsey, Edwin Carlile, Lebanon, Ky. (1926)
• Littel, Edmund M., Traverse City, Mich. (1937)
• Little Flower Circle, Grand Rapids, Mich. (1932)
• Little Flower Magazine, Oklahoma City, Okla. (1928)
• Little Review, Chicago, Ill. (1914)
• Little Story Magazine, Philadelphia, Pa. (1920)
• Live Girl Stories, New York, N.Y. (1929)
• Live Wire, Buffalo, N.Y. (1927-1928)
• Lively Stories, New York, N.Y. (1930)
• Lloyd, David, New York, N.Y. (1936-1937)
• Lloyd, Everett, San Antonio, Tex. (1928)

Correspondence to or from:

• MCA Management, Ltd., New York, N.Y. (1948-1949)
• M.I.T. Club of Birshire County, Pittsfield, Mass. (1947)
• Mabie, Louise Kennedy, Pasadena, Calif. (1938)
• MacArthur, C.L. & Son, Troy, N.Y. (1908)
• MacBeth, Madge, Ottawa, Ont. (1950)
• McBride, W.L., Chicago, Ill. (1938)
• McCall Corporation, New York, N.Y. (1922-1938)
• McCann, C.W., North Hollywood, Calif. (1930)
• McCann, H.K. Company, New York, N.Y. (1926)
• McCann-Erickson, Inc., New York, N.Y. (1939)
• McCarter, Margaret Hill, Topeka, Kan. (1932)
• McCarthy's Book Store, Minneapolis, Minn. (1919)
• McClatchy, V.S., Sacramento, Calif. (1910)
• McClelland & Stewart, Ltd., Toronto, Ont. (1919)
• McClure, Marjorie Barkley, Cleveland, Ohio. (1932)
• McClure, O.J. Advertising Agency, Chicago, Ill. (1923)
• McClure Publications, New York, N.Y. (1908-1916)
• McCord, Mather M., Rome, Ga. (1928)
• McCormick, Leander J., Chicago, Ill. (1913-1925)
• McCorquodale, W.E., Orange, Tex. (1926)
• McCoy & Company, Chicago, Ill. (1914-1915)
• McCuaig, C.B., Buffalo, N.Y. (1930)
• McCutcheon-Gerson Advertising, Chicago, Ill. (1921)
• McDonald, J.C., San Antonio, Tex. (1930)
• MacDougal, R.K., South Bend, Ind. (1926)
• McGillicuddy, O.E., Toronto, Ont. (1924)
• McGlathery, Pattie, Greenwood, Miss. (1936)
• McGraw, Frank E., Billings, Mont. (1916)
• McGraw-Hill Book Company Inc., New York, N.Y. (1929-1933)
• MacHarg, William, New York, N.Y. (1921-1923)
• McHenry Flour Mills, McHenry, Ill. (1920)
• Machinists Monthly Journal, Washington, D.C. (1923)
• McIlvaine, Ellen, New York, N.Y. (1934)
• McIntosh Battery & Optical Company, Chicago, Ill. (1914)
• McIntyre, John T., Philadelphia, Pa. (1926-1938)
• McIntyre, O.O., New York, N.Y. (1927)
• McJunkin Advertising Company, Chicago, Ill. (1932)
• Mack, Helen, New York, N.Y. (1949)
• Mack, Thomas D., Albuquerque, N.M. (1923)
• McKenny, W.E., Chicago, Ill. (1920)
• McKeogh, Elsie, New York, N.Y. (1939)
• McKinley Publishing Co., Kansas City, Mo. (1928-1929)
• MacLean, Charles Agnew, New York, N.Y. (1926)
• Mcleod & Allen, Toronto, Ont. (1910)
• MacManus, Seumus, New York, N.Y. (1909-1918)
• McMichael, Jean, Toronto, Ont. (1929)
• McNary, Herbert L., Dorchester, Mass. (1932)
• Macon Chamber of Commerce, Macon, Ga. (1937)
• Mac's Magazine Shop, Chicago, Ill. (1934)

Correspondence to or from:

• Mademoiselle, New York, N.Y. (1935-1941)
• Madison Buyer's Guide, Madison, Wis. (1934)
• Madison State Journal, Madison, Wis. (1912)
• Magazine, Chicago, Ill. (1935)
• Magazine Digest, New York, N.Y. (1942-1944)
• Magazine, Exchange, Chicago, Ill. (1944)
• Magazine Feature Service, Chicago, Ill. (1928-1941)
• Magazine Maker Publishing Co., New York, N.Y. (1912)
• Magazine of Business, New York, N.Y. (1929)
• Magazine of Wall Street, New York, N.Y. (1919)
• Magazine World, New York, N.Y. (1925-1947)
• Magee, John Company, Chicago, Ill. (1911-1912)
• Magnificant, Manchester, N.H. (1926-1939)
• Magniphone Company, Chicago, Ill. (1916)
• Maier, Howard, New York, N.Y. (1949)
• Maine Motorist, Portland, Me. (1930-1932)
• Maize, Lillian Taft, Pasadena, Calif. (1936)
• Management, Chicago, Ill. (1927-1928)
• Mandick, John, Chicago, Ill. (1949)
• Mandick, Richard, Chicago, Ill. (1947)
• Manhattan Merchant, New York, N.Y. (1930)
• Manley, Stuart, Cloquet, Minn. (1946)
• Mann, Helen Avis, Madison, Wis. (1945)
• Mannados Bookshop, New York, N.Y. (1948)
• Mansfield, Justin, Chicago, Ill. (1942)
• Manufacturers Club of Philadelphia, Philadelphia, Pa. (1927)
• Manufacturers News, Chicago, Ill. (1927-1928)
• Manufacturers Record, Daytona Beach, Fla. (1928)
• Manufacturing Industries, New York, N.Y. (1928)
• Manuscript Market Guide, Highland Falls, N.Y. (1928)
• Manuscript Mart, Chicago, Ill. (1928)

Correspondence to or from:

• Mason, Edith Huntington, Chicago, Ill. ([19--])
• Mason, Grace Sartwell, New York, N.Y. (1931-1932)
• Masonic Home Journal, Louisville, Ky. (1929)
• Masonic Magazine, Detroit, Mich. (1928)
• Masonic News, Detroit, Mich. (1930)
• Masonic Observer, Chicago, Ill. (1940)
• Masonic Outlook, New York, N.Y. (1926-1927)
• Massachusetts Guardsman, Boston, Mass. (1938)
• Masson, Thomas L., Glen Ridge, N.J. (1923-1926)
• Masterman, Mildred Stanley, Portland, Me. (1952)
• Mateo, F. Alex, Lima, Peru. (1951)
• Mathews, Betty, Chicago, Ill. (1950)
• Mathews Company, Detroit, Mich. (1936)
• Mathews-Northrup Works, Buffalo, N.Y. (1928)
• Matson, D.H., South Whitley, Ind. (1930)
• Matteson-Fogarty-Jordan Co., Chicago, Ill. (1930)
• Mattingly, Seth W., Dearborn, Mich. (1947)
• Mauerman, Ruth, Chicago, Ill. (1935)
• Maxwell, Eleanor G., Pittsburgh, Pa. (1953)
• Maxwell, Victor, New York, N.Y. (1926)
• Mayer, Howard G., Chicago, Ill. (1935)
• Mayer, Irma R., Denver, Colo. (1935)
• Mayer, Ruth R., New York, N.Y. (1933)
• Mayer Service, Los Angeles, Calif. (1937)
• Mayer Studio, Los Angeles, Calif. (1922)
• Mayfair, Toronto, Ont. (1940)
• Mayflower Company, London, England. (1924)
• Mayo, Eva B., [?]. (1901)
• Maytag Company, Newton, Iowa. (1928-1929)

Correspondence to or from:

• Messenger of the Precious Blood, Carthagena, Ohio. (1938)
• Messenger of the Sacred Heart, New York, N.Y. (1931-1941)
• Messenger of Our Lady of Sorrows, Chicago, Ill. (1924-1929)
• Messner, Julian, Inc., New York, N.Y. (1933-1939)
• Meteor Stamp and Publishing Co., Toronto, Ont. (1914)
• Methodist Book Concern, Cincinnati, Ohio. (1914-1937)
• Central Methodist Episcopal Church, Endicott, N.Y. (1935)
• Methodist Episcopal Church, Nashville, Tenn. (1928)
• Metropolis, Newark, N.J. (1934-1935)
• Metropolitan Home Journal, New York, N.Y. (1931-1932)
• Metropolitan Life Insurance Company, New York, N.Y. (1924-1926)
• Metropolitan Newspaper Service, New York, N.Y. (1921-1927)
• Metropolitan Publishers, Chicago, Ill. (1932)
• Metropolitan Review, New York, N.Y. (1926)
• Metropolitan Sound Studios, Hollywood, Calif. (1930)
• Meyer, E.M., Chicago, Ill. (1915)
• Mezquida, Anna Blake, San Francisco, Calif. (1936)

Correspondence to or from:

• Mind Magic Magazine, Philadelphia, Pa.(1931)
• Mineapolis Daily Times, Minneapolis, Minn.(1942)
• Minneapolis-Moline Power Implement Company, Minneapolis, Minn.(1931)
• Minneapolis Star Journal and Tribune, Minneapolis, Minn.(1939-1943)
• Minnesota Historical Society, St. Paul, Minn.(1948)
• Minor, Frank E., Chicago, Ill.(1919)
• Minton, Balch & Co., New York, N.Y.(1932-1936)
• Miraculous Medal, Germantown, Pa.(1930-1942)
• Miranda, Steve, San Francisco, Calif.(1928)
• The Mirror, New York, N.Y.(1933)
• The Mirror, Winnipeg, Man.(1940)
• Miss America, New York, N.Y.(1943)
• "Mrs", New York, N.Y.(1939)
• The Missionary, Washington, D.C.(1927-1938)
• Mississippi Motor News, Davenport, Iowa.(1927)
• Missouri Farmer, Columbia, Mo.(1938-1940)
• Missouri Homestead, Columbia, Mo.(1923)
• Missouri Motorist & Apropos, Columbia, Mo.(1939)
• Missouri Pacific Railway Company, St. Louis, Mo.(1923)
• Missouri Ruralist, St. Louis, Mo.(1921-1931)
• Mitchell, Charles, Roslindale, Mass.(1952)
• Mitchell, Henry Willis, New York, N.Y.(1926)
• Mitchell, Marion Strobel, Chicago, Ill.(1936-1943)
• Mitchell, Ruth Comfort, Los Gatos, Calif.(1931-1932)
• Mitchell Motors Company, Inc., Racine, Wis.(1918)
• Mittler, S., New York, N.Y.(1947)

Correspondence to or from:

• Morand, Cyril, Philadelphia, Pa. (1950)
• Morehouse, Hopkins, Winnipeg, Man. (1925)
• Morehouse Publishing Company, Milwaukee, Wis. (1932)
• Morey, Walt, Dallas, Tex. (1950)
• Morgan, Ernest, Yellow Springs, Ohio. (1938)
• Morgan, J.E., Chicago, Ill. (1914)
• Morgan, John J., Boston, Mass. (1917)
• Morlan, George K., Springfield, Mass. (1948)
• Moroney's Merger, Cincinnati, Ohio. (1915)
• Moroso, John, Cresskill, N.J. (1927-1931)
• Morrill, Edward & Son, Boston, Mass. (1948)
• Morris, Gouveneur, New York, N.Y. (1913)
• Morris, William Agency, New York, N.Y. (1936)
• Morris Book Shop, Chicago, Ill. (1914)
• Morrison, Noah Farnham, Elizabeth, N.J. (1917)
• Hotel Morrison, Chicago, Ill. (1936)
• Morrow, William & Co., New York, N.Y. (1930-1939)
• Morse, Grace, New York, N.Y. (1932-1940)
• Mosher, Jack H., Toronto, Ont. (1935)
• Mosher, Thomas B., Portland, Me. (1935)
• Mostman Book Shop, Newark, N.J. (1933)
• Moss, James Clayton, Belton, Tex. (1947)
• Motion Picture Producers and Distributors of America, New York, N.Y. (1935-1937)
• Motor, New York, N.Y. (1927)
• Motor Age, Chicago, Ill. (1927)
• Motor Boating, New York, N.Y. (1924-1939)
• Motor Chat, New York, N.Y. (1925)
• Motor Express, Boise, Idaho. (1924)
• Motor in Canada, Winnipeg, Man. (1927-1930)
• Motor Maintainence, Chicago, Ill. (1927)
• Motor Service, Chicago, Ill. (1927-1930)
• Motor Topics, Cincinnati, Ohio (1939)
• Motor Travel, New York, N.Y. (1927)
• Motor West, Los Angeles, Calif. (1927-1935)
• Motordom, Albany, N.Y. (1922-1932)
• Motorists Association of Illinois, Chicago, Ill. (1930)
• Motorman Conductor and Motor Coach Operator, Detroit, Mich. (1940)
• Motorowner, Kansas City, Mo. (1928)
• Motortrade, Kansas City, Mo. (1928)
• Motour, Cincinnati, Ohio (1927)
• Moulton, Roy K., New York, N.Y. (1923)
• Mounier, J.F., Newport Beach, Calif. (1935)
• Moving Picture Review Digest, New York, N.Y. (1936)
• Movie Home Journal, Boston, Mass. (1932)
• Movienews, Chicago, Ill. (1933)
• Movie Romances, Chicago, Ill. (1933)
• Mowery, William Byron, Sarasota, Fla. (1932-1938)
• Mowre, Carson W., New York, N.Y. (1935)
• Moyle, Seth, New York, N.Y. (1913-1916)

Correspondence to or from:

• Oakland Tribune, Oakland, Calif. (1921-1931)
• Oberlin College Library, Oberlin, Ohio (1938)
• O'Brien, George, Olkhorn, Wis. (1932-1936)
• O'Brien, Howard Vincent, Chicago, Ill. (1932-1933)
• Observer, Brooklyn, N.Y. (1928)
• O'Connor, Edward, St. Louis, Mo. (1930)
• O'er The Threshold, Grand Rapids, Mich. (1930-1932)
• Office Appliances, Chicago, Ill. (1928)
• Office Equipment Company, Chicago, Ill. (1935)
• O'Flaherty, John, Hollywood, Calif. (1931)
• Ogden, George W., Van Nuys, Calif. (1935-1938)
• Ogle, Nina Wilcox Putnam, Palm Beach, Fla. (1933)
• Ohio Legion Councillor, Toledo, Ohio. (1930)
• Oklahoma City Times, Oklahoma City, Okla. (1924-1932)
• Old Colony Magazine, New York, N.Y. (1928)
• Old Stone Mill, Whitewater, Wis. (1936)
• Oldsmobile Pacemaker, Lansing, Mich. (1926)
• Olympic Games Contest, Los Angeles, Calif. (1932)
• Omaha Bee, Omaha, Neb. (1923)
• Onlooker, Detroit, Mich. (1931)
• Onward, Toronto, Ont. (1924-1932)
• Onward, Richmond, Va. (1931)
• Oovici-Fiede, New York, N.Y. (1932)
• Open Road, Boston, Mass. (1921-1923)
• Opportunity, Chicago, Ill. (1924-1932)
• Optimist International, St. Louis, Mo. (1928-1932)
• Orchard and Farm, Los Angeles, Calif. (1921)
• Oregon Golf & Sportsman, Portland, Or. (1931-1932)
• Oregon Legionnaire, Portland, Or. (1930)
• Oriental Stories, Chicago, Ill. (1931-1932)
• Orr, Myron David, Caro, Mich. (1936)

Correspondence to or from:

• Pearson, Edmund Lester, New York, N.Y. (1937)
• Pelican's Chicago Squab, Chicago, Ill. (1929)
• Pelley, William Dudly, Boston, Mass. (1931)
• Pelley Publishers, Asheville, N.C. (1935-1936)
• Pemberton, Robert L., St. Marys, W.Va. (1924)
• Pen and Ink, St. Louis, Mo. (1931)
• Pendry, H.E. Company, Topeka, Kan. (1927)
• Pennsylvania Farmer, Pittsburgh, Pa. (1926-1937)
• Pennsylvania Guardsman, Harrisburg, Pa. (1939)
• Pennsylvania Motorist, Pittsburgh, Pa. (1927)
• Pennsylvania News, Pittsburgh, Pa. (1927)
• Penoyer, Ruth, New York, N.Y. (1933-1934)
• Peoples Companion Magazine, Dayton, Ohio. (1933)
• Peoples Gas Light & Coke Company, Chicago, Ill. (1928)
• People's Press, Inc., Manila, P.I. (1937-1939)
• Pere Marquette Magazine, Detroit, Mich. (1922-1926)
• Periodical Press of Canada, Toronto, Ont. (1922)
• Perkins, Dwight H., Evanston, Ill. (1928)
• Perry, George Boardman, Minnineague, Mass. (1930)
• Perry, Jennings, Jackson, Tenn. (1934)
• Perry, Lawrence, New York, N.Y. (1934-1936)
• Pershing, General John J., Washington, D.C. (1924-1930)
• Petroleum Marketer, Tulsa, Okla. (1928-1929)
• Petzinger, Lambert, Little Falls, N.J. (1930)
• Phantasmus, Pittsburgh, Pa. (1924)
• Phelan & Balfour, Toronto, Ont. (1922)
• Philadelphia Chamber of Commerce, Philadelphia, Pa. (1933)
• Philadelphia Daily News, Philadelphia, Pa. (1936)
• Philadelphia Magazine Depot, Philadelphia, Pa. (1916)
• Philadelphia Sunday Item, Philadelphia, Pa. (1927)
• Philadelphia Sunday Transcript, Philadelphia, Pa. (1927)
• Philadelphian, Philadelphia, Pa. (1925-1926)
• Philbin, Agnes, Chicago, Ill. (1911)
• Philbrick, Allen, Chicago, Ill. (1917)
• Philip, Alex J., Gravesend, England. (1935)
• Phillips, I.W., Chicago, Ill. (1934)
• Phillips, Leroy, Boston, Mass. (1917)
• Phillpotts, Eden, Torquay, England. (1921)
• Philopolis Press, San Francisco, Calif. (1914)
• Phoenix Hosiery Co., Milwaukee, Wis. (1928-1929)
• Physical Culture Magazine, New York, N.Y. (1931-1932)

Correspondence to or from:

• Point of View Publishing Company, Kansas City, Mo. (1923)
• Police 1313, Chicago, Ill. (1927-1930)
• Policeman's Monthly, Inc., New York, N.Y. (1914)
• Polk, R.L. & Co., Detroit, Mich. (1927-1935)
• Pollock, Frank L., Shedden, Ont. (1931-1937)
• Pomeroy, Claire, New York, N.Y. (1932)
• Pontiac Daily Press, Pontiac, Mich. (1937)
• Poole Bros., Chicago, Ill. (1922)
• Poppy, Martha, Drummond, Wis. (1928)
• Popular Fiction Magazine, Chicago, Ill. (1931)
• Popular Mechanics Magazine, Chicago, Ill. (1929-1931)
• Popular Publications, New York, N.Y. (1935-1937)
• Popular Radio, New York, N.Y. (1922)
• Popular Science Monthly, New York, N.Y. (1926-1929)
• Portal, Cincinnati, Ohio. (1924-1937)
• Porter, Rebecca N., Hollywood, Calif. (1938)
• Portland Cement Association, Chicago, Ill. (1929)
• Portland Evening Express, Portland, Me. (1934)
• Portland Evening Press, Portland, Me. (1934)
• Portland Journal, Portland, Or. (1932-1936)
• Portland Oregonian, Portland, Or. (1919-1936)
• Portland Telegram, Portland, Or. (1918-1925)

Correspondence to or from:

• Post, Melville Davisson, Lost Creek, W.Va. (1926)
• Postage Magazine, New York, N.Y. (1927)
• Postal Telegraph Co., Chicago, Ill. (1910-1939)
• United States Post Office, Chicago, Ill. (1910-1939)
• Postum Company, New York, N.Y. (1929)
• Pottle, Juliet Wilbor Tompkins, New York, N.Y. (1923-1936)
• Poultry Tribune, Mount Morris, Ill. (1923)
• Powel, Harford, New York, N.Y. (1935)
• Powner, Charles T. Co., Chicago, Ill. (1927-1934)
• Poynter, Beulah, New York, N.Y. (1932-1934)

Correspondence to or from:

• Rhea, Ira B., Harbert, Mich. (1916)
• Rhoades, S.N., Philadelphia, Pa. (1917-1919)
• Rice, Chester H., New York, N.Y. (1913)
• Rice, Frank Henry, New York, N.Y. (1921-1922)
• Rice, Grantland, New York, N.Y. (1945)
• Rice, T.J., Chicago, Ill. (1916-1918)
• Rice, Virginia, New York, N.Y. (1941-1944)
• Rice, Wallace, Santa Barbara, Calif. (1912-1920)
• Rich, Louise Dickinson, Philadelphia, Pa. (1943)
• Rich, Vernon W., Boston, Mass. (1945)
• Richards, P., Berlin, Germany. (1921)
• Richland Farm Products Company, Richland Centre, Wis. (1914)
• Richmond Times-Dispatch, Richmond, Va. (1918)
• Richmond Virginian, Richmond, Va. (1915-1917)
• Ricketts, C.L., Chicago, Ill. (1920)
• Ridge Farm Creamery, Ridge Farm, Ill. (1916)
• Ridgway Company, New York, N.Y. (1916)
• Ridley Candy Maker, New York, N.Y. (1913)
• Riess, Curt, New York, N.Y. (1943)
• Rigby, George H., Philadelphia, Pa. (1914)
• Riggs, Arthur Stanley, Thorndale, Pa. (1916)
• Riley & Britton, Chicago, Ill. (1913)
• Ringer, Max, Chicago, Ill. (1916)
• Ringlet Hill Poultry Farm, Cayuga, Ill. (1916)
• Ringley, Fred J. Company, Chicago, Ill. (1917-1919)
• Ringo, Paul, Stevensville, Mich. (1915-1917)
• Ringrose, Hyacinthe, New York, N.Y. (1941)
• Ringsmuth, L.J., Clear Rapids, Iowa. (1916)
• Rivers, B. Lucille, Chicago, Ill. (1916-1917)