| 1. |  | Outgoing Correspondence from Robert Ridgway, June 24, 1867 | Handwritten outgoing correspondence from Robert Ridgway to Mother (Harriet Ridgway), June 24, 1867. This letter, titled Sacramento, California, Camp no. 1, U.S.G.S. described to his father the establishment of the survey party's first camp. | Ridgway, Robert, 1850-1929 |