Beginning in the 1790s, the American Philosophical Society began to accumulate vocabularies and texts written in Native American languages, guided by Thomas Jefferson's idea of using comparative linguistics to reconstruct the histories of Indian peoples and discern their origins. The American Indian Vocabularies Collection was initially assembled by the Historical and Literary Committee of the APS for publication in 1816. They include information on seventeen North American languages and one each from the Caribbean and Central America, collected between 1784 and 1828. A number of individuals were invovled in recording the vocabularies, including Benjamin Hawkins, William Thornton, David Campbell, Daniel Smith, Constantine Volney, Constantine Rafinesque, William Vans Murray, John Heckewelder, Martin Duralde, Campanius Holm, and Jefferson himself. Most followed the standardized word set established by Jefferson.

The Daythal L. Kendall papers consist of a wide variety of published and unpublished work on especially Takelma, Kalapuyan languages, and Lencan languages. A linguist and computer scientist, Kendall devoted much time to synchronic and diachronic linguistics of Takelma and the Penutian stock, including much research on Takelma poetic forms, Kalapuyan morphology and gathering a large unpublished lexicon for Lencan languages. He also produced pedagogical materials for learning Canadian Aboriginal syllabics, and worked twice for the American Philosophical Society to develop their understanding of their Native American collections. In the papers are correspondence, extensive research and manuscripts on the above, collected materials from others including many handouts from conferences (particularly the Society for the Study of the Indigenous Languages of the Americas), lexical slips, and photographs of Native Oregonians and their land.