Series consists of material relating to field work conducted by Hynes in various locations throughout his career, including the British Isles, Africa, the British West Indies, Australia, and North America. Includes mainly notebooks and loose papers containing ms. and ts. field notes, most recorded by Hynes but some also recorded by research assistants or technicians. Notebooks include drawings, charts, graphs, maps, etc. Series also includes some ms. notes by Hynes from the scientific literature as well as a small amount of correspondence.

Series consists of maps and aerial photographs accumulated by Hynes in his research. Maps depict locations in Austraila, Tasmania, Great Britian, Trinidad, and Ontario.

Series consists of miscellaneous items: a flyer advertising a book by Hynes, and a card and photographs sent to him.

Series consists of published works authored or co-authored by Hynes. Includes offprints and reprints as well as several small volumes. Series is not exhaustive and does not include all published works by Hynes.

Series consists of published works authored by others. Also included are several reports by bodies with which Hynes was associated.

Series consists of material relating to research conducted by Hynes for various projects throughout his career. Includes ms. and ts. notes taken by Hynes from the scientific literature; reports by Hynes and other researchers; correspondence; several draft papers by Hynes; drawings, charts, and maps; and note cards.