Correspondence, notes, photography permissions, and documents accumulated during research for the publication of his book We Have Not Vanished: Eastern Indians of the United States. Folder one contains copy of a draft of the publication titled "American Indians Today on the Atlantic Seaboard." Has the original photos that were to be used for the publication taped or laid into the pages. Folder two, list of George Catlin slides. Folder three, edits, revisions, additions, other historical notes, sent to Tamarin from Indians and other editors. Folder four, an introduction and edits for the book by Irving Powless, Jr. and correspondence from him and editor Sandra Greifenstein. Also copies of treaties of the Iroquois Six Nations and the United States. Folder five, correspondence regarding Indian populations from government offices, including United States Department of the Interior, Bureau of Indian Affairs, the state offices of Connecticut, Georgia, Massachusetts, New Hampshire, Vermont, and Virginia, also The Champlain Society and Wesleyan University.

Folder six, correspondence and assorted ephemera. Folder seven, copies of published tribal information. Folder eight, data sheets for New York State Indian reservations, includes population, history, economic status, culture, and government information. Reservations covered are, Allegany, Cattaraugus, Onondaga, Poospatuck, St. Regis Mohawk, Shinnecock, Tonawanda, and Tuscarora. Folder nine, photography permissions for the illustrations used in the book, includes copies of the illustrations. Folder ten, Tamarin's notebook. Includes notes and contact information recorded during his research, also laid in postcards, photos, other ephemera. Folder eleven, 1970 census information. Includes official census publications and hand written notes on Indian populations for eastern states.