(Jacobsen, Josephine Collection.) | Letters; postcards. | (Warren, William F. Collection.) | Letter to Ginn and Heath, dated Princeton, 6/17/1882 acknowledging receipt of Dr. Warren's Key to ancient cosmology. Holograph. | (Frye, William Collection.) | Letter. | (Rather, Dan Collection.) | Letters; copy of letter to Richard Salant. | (Wiesel, Elie Collection.) | Letter, (TLS), (4/08/83). | (Leghorn, Richard Collection.) | TNS, Nov. 23, 1982. | (Daly, Tyne Collection.) | Correspondence | (Warren, William F. Collection.) | Letter to William F. Warren, dated Bridgwater, 6/14/[1890] | (Richards Manuscript Collection.) | Inscribed photograph. Ms., 4 p., 5/23/1915 | (Brailowsky, Alexander Collection.) | Letter; signed inscription on photograph of himself. | |