Contains Sapper's field notes on the Chortí vocabulary. Contains also two letter-size sheets which contain an index to the words in the list.

Contains three notebooks with scientific notes from the South American Expedition. Entries date from between 1900 and 1902.

Contains diaries, field notes, and writings by Van Buren related to the South American Expedition. Materials date from between 1899 and 1902.

Materials contain personal and professional correspondence belonging to Beck, as well as professional career fieldnotes, guidebooks, reports, books, and articles relating to Entomology and Zoology.

Contains Robert G. Bee's field notes from his lengthy study of birds and their nesting behaviors. Most of his research focus on birds native to Utah. The notes date from 1924-1962.

Contains diaries, field notes, articles, and other materials about Van Buren and his participation in the South American Expedition. Materials date from between 1899 and 1968.

Contains plant lists, classifications of ailments, Maya medical vocabulary, and notes relating to Gates' 1930-1940 study of Maya medical literature.

Contains extensive field notes from September 1935 for the identification of Yucatan plants and medicinal uses.

Contains correspondence, written proposals, research notes, and data associated with an Atomic Energy Commission research project Wilmer W. Tanner undertook primarily in the 1960s. Materials dated approximately 1959-1968.