Fonds consists of biographical notes, clippings, articles, early educational records, research notes, draft manuscripts, field notebooks, reports, publications, correspondence, lecture and course notes, maps, photographic prints, and slides pertaining to M.Y. Williams' professional and personal activities.

The sous-fonds consists of miscellaneous personal correspondence and notes regarding Dr. Slaymaker's research interests. The Miscellaneous series is the only series in the sous-fonds.