Papers of the American painter. Correspondence, photographs of work, exhibition catalogs, and miscellaneous published material. Correspondents include William C. Agee, John H. Bradley, Alexander Brook, Louise Bryant, Jerry Bywaters, Witter Bynner, Peggy Church, Howard Cook, Philip Dedrick, Arthur Davison Ficke, Edwin Gamble, Marsden Hartley, Richard Hollander, Lila Howard, D.H. Lawrence, Ward Lockwood, Erle Loran, Mabel Dodge Luhan, Henry Lee McFee, John Marin, Georgia O'Keeffe, Louis Ribak, Morgan Russell, Lesley Simpson, Carl Van Vechten, Victor White, Owen Wister, and others.

Correspondence (1928-1972); artwork (original watercolors and reproductions); writings by Cook (articles, essays, reminiscences about the Taos community, statements and notes on Cook's artistic philosophy); and memorabilia, including financial and legal documents, and printed material (articles, reviews, clippings about Cook, exhibition announcements, invitations, and catalogs). Correspondents include artists Ernest L. Blumenschein, Victor Candell, Jean Charlot, Fred Conway, Russell Cowles, Andrew Dasburg, Lamar Dodd, Ernest Fiene, Lez Haas, John Haley, Ward Lockwood, Henry Lee McFee, B.J.O. Nordfeldt, Arthur Osver, Rudolph Ruzicka, Millard Sheets, and Carl Zigrosser. Other correspondents include Margaret Anderson, Joseph Blumenthal, John Hodgdon Bradley, J. Frank Dobie, and Lenore Marshall. Extensive correspondence relating to Cook's mural work includes that of the Mayo Clinic, the U. S. Post Office, the U.S. Public Buildings Administration, and the U.S. Treasury Department.