Field Collection Numbers, Plantas Recogidas en Guayana

The Research Papers consist of subject files on (a) latex-yielding plant species; (b) gum and rubber products; (c) tropical woods; (d) agricultural and forest resources (by country); and (e) genus files. There are 13 files of bibliographic material, 22 files of field exploration reports (primarily from Brazil), and 9 files of photo indices (see Series 6: Photographic Material). Thirty-eight files of data entitled "Field Collection Numbers" are organized regionally and/or sequentially (e.g. "18000" sequence). Of these there is comprehensive collection data on Peruvian woods (1929-1930), Orinoco River basin plants (1939-1942), Plantas Venezolanos (1938), and Plantas Recogidas en Guayana (1940) among several others. These files consist of transcriptions of field notebook data for which see Series 12: Field Notebooks below.

Research milestones of Dr. Williams' career are documented with data on the Marshall Field Amazon Expedition (1929), Rubber Development Corporation reports on sources of South America rubber during World War II (1942-46), Dreyfus Corporation reports and memoranda, and research on chicle and chilte for the Wrigley Chewing Gum Co. Several files relate to government research under the auspices of the USDA on the effects of herbicides and patterns of successional forest growth after defoliation. For this project see under Advanced Research Projects Agency; Forests of Southeast Asia, Puerto Rico, and Texas; Thailand; Vietnam, and various USDA files. An index card file is located in Box 18, and oversize documents in Boxes 19-22.

Arranged alphabetically by subject