Head of the Historical Division of the Carnegie Institution, the archaeologist Alfred V. Kidder specialized in the cliff dwelling cultures of the American Southwest, and is best remembered for work at Pueblo Bonito, Chaco Canyon, and Pecos del Arroyo. Primarily personal in nature, the exchange of letters between Kidder and his colleague and friend Neil M. Judd provides some details on their work on the archaeology of the Southwest. The 68 letters include sporadic references to excavations at Pueblo Bonito, Chaco Canyon, and other archaeological sites, with a few references to other archaeologists and anthropologists.

An archaeological anthropologist and linguist, John Alden Mason spent the majority of his career at the University Museum of the University of Pennsylvania. After receiving his undergraduate degree at Penn in 1907, Mason received a doctorate at Berkeley (1911) for his ethnographic work on the Salinan Indians of California, but his diverse interests in later years ran the gamut from Puerto Rican folklore to Piman languages and cultures (including Pima, Papago, Pima Bajo, Northern and Southern Tepehuan, and Tepecano), Mayan, Aztec, and Incan archaeology, and the languages of South American Indians. Mason was curator of the University Museum at Penn from 1926 until his retirement in 1958. The Mason Papers include both in-coming and outgoing correspondence, linguistic material, notes, and photographs relating to Mason's work in the southwestern U.S., northern Mexico, and South America. Centered on the years after Mason's return to Philadelphia in 1926, the collection covers all aspects of Mason's professional life, from reports on field work to answering casual questions referred to him through the University Museum to data and analyses on Piman and other languages. The collection also contains voluminous files relating to the Mason's editorship of the American Anthropologist (bulk: 1945-1948). Of special note are a series of class notes (1908-1910) kept by Mason for course work in ethnology, archaeology, and linguistics at the University of Pennsylvania under Edward Sapir and Frank Speck.

A Yale-educated ethnographer, William Fenton devoted most of his career to study of the Haudenosaunee. Receiving his doctorate in 1937, Fenton worked with the Bureau of American Ethnology for a number of years before becoming Director of the New York State Museum and professor at SUNY Albany. The Fenton Papers covers all aspects of William Fenton's professional life, documenting his varied positions as community worker for the New York Agency of the U.S. Indian Service, 1935-1937 (accounts, reports, correspondence); associate anthropologist and senior ethnologist in the Bureau of American Ethnology, 1939-1951 (includes notebooks, letters from the field); Executive Secretary of Anthropology and Psychology, National Academy of Sciences-National Research Council, 1952-1954; and Assistant Commissioner, New York State Museum and Science Service, 1954-1968.

Elsie Clews Parsons (1875-1941) was trained as a sociologist at Columbia University, but made her greatest achievements in the fields of anthropology and folklore. Parsons' early works in the field of sociology dealt primarily with gender roles, conventions of society, and the effect of society's pressures on the individual. After a trip to the American Southwest with her husband in 1910, Parsons' interests turned to anthropology. She began making field trips to Arizona and New Mexico and, under the influence of her friend Franz Boas, Parsons recorded in meticulous detail data on social organization, religious practices, and folklore of the Southwest Indians. Concurrently, Parsons conducted research in folklore, concentrating on folk tales of Afro-Americans and Caribbean peoples. She was active in a number of professional associations and was the associate editor of the Journal of American Folklore from 1918 until her death. The Parsons Papers were acquired as two separate accessions and remains organized in two distinct subcollections. Subcollection I (572 P35), acquired in 1949, contains approximately 12 linear feet of materials focused on Parsons' career in anthropology. Subcollection II, acquired in 1985, consists of 26.25 linear feet of materials divided into ten series, covering a larger scope of Parsons' life, including family and personal correspondence.

For many years referred to as the "Franz Boas Collection of American Indian Linguistics," this collection consists of a large body of linguistic and ethnographic material gathered together by Boas and many of his colleagues and students primarily from the 1890s to the 1940s. It contains the bulk of Boas's own fieldwork material, with the main exception of most of his Inuit and earliest Northwest Coast fieldwork. It contains the majority of the work sponsored by American Council of Learned Societies Committee on Native American Languages, which was directed by Franz Boas, Edward Sapir, Alfred Kroeber, and other academic linguists from 1927-1937. The collection, however, also contains related kinds of fieldwork and derived secondary materials created outside the auspices of this Committee, both earlier and later. The first deposit of the material arrivied in 1945. Subsequently, additional related materials were donated and added, as noted in the listings. Additionally, the documentary materials produced by some of the early projects (1945 to circa 1955) of the APS Phillips Fund for Native American Research were added to this collection. The collection has grown to over 80 linear feet of material representing at least 166 languages and dialects from the United States, Canada, and Mexico. The formats range from field notes and ethnographic texts to slip files, vocabularies, lexica, and grammars, and dozens of linguists and Native consultants are represented.