File consists of material found inside the commemorative volume containing a record of events held during the centennial year. Includes a typed draft of the book's colophon, an invitation to the centennial day celebration, a photograph of the association office in the winter, and two red regatta ribbons.

File consists of a letter from Jim O'Brien to the Muskoka Lakes Association, including six photographs and a page containing descriptions of them.

File consists of material relating to the administration of the MLA and various activities at the association office, including the coordination of yearbook production, office supplies, the Cottage Watch program, advertising, and other tasks. Includes correspondence (some faxed) and memoranda, invoices, photographs for the yearbook, typed information, etc.