Rice, A. Hamilton "The Rio Negro, the Casiquiare Canal, and the Upper Orinoco", 1921

There are approximately 6 boxes of manuscripts and typescripts in English and Spanish. Although other authors are represented, Llewelyn Williams authored most of the material, some of which is unpublished. Topics include plant collecting, botanical exploration, latex-yielding plant species, latex products and toxicity, phytogeography, wood technology, commercial applications, vernacular names of plants, agricultural development, and forest resources. There are drafts of industrial reports and a reference compilation of American woods as well as various biographical, historical, and popular writings. Transcripts of radio broadcasts include a Universal Broadcasting Council program (1937) "From the Ends of the Earth" (see Series 8: Audio Recordings). Oversize material is located in Box 19. See also Series 4: Personal Papers for autobiographical writings, reminiscences, and short stories; and Series 10: Publications for related published material.

Arranged alphabetically by author, thereunder alphabetically by title.