Gums and resins.

Scope and Contents The collection consists of correspondence, manuscripts and typescripts, research papers, personal papers, maps, travel memorabilia, audio tape recordings (dictaphone), film (16mm), artifacts, and photographic material which includes positive and negative prints, glass negatives, and color slides. A portion of the photography appears in scrapbooks and bound publications. The collection covers most of Dr. Williams' career including botanical research and fieldwork with the Chicago (Field)...