The fonds consists of documentation of John Clark's life; correspondence with his friends, colleagues, and business associates; documents and lecture notes from his academic career; scholarly articles and reviews; sketchbooks, notebooks and photographic studies for his artworks; catalogues and other records of his exhibitions; personal photographs; photographs of his artworks and exhibitions; and sound recordings and video recordings related to his work. The fonds includes materials collected by Pamela Clark following John's death. She arranged and annotated some of the files.

The fonds consists of Clydesdale pedigree records (1933-1946), sheep pedigree records (1904-1928), tax notices (1928-1941), threshing record books (1916,1923), noxious weeds notice book (1917), and various family certificates, photographs, invitations and programs.