Letters regarding the survey of Yosemite Valley

Excerpt from letter written by U.S. Surveyor General Lauren Upson on September 27, 1864 in San Francisco, California, to U.S. Deputy Surveyor James T. Gardner, outlining instructions for conducting a survey of Yosemite Valley and the Mariposa Grove. Governor's Office Papers (GP2:101d), California State Archives.

Letter written by Frederick Law Olmsted on October 10, 1864 in Bear Valley, California, to Governor Frederick F. Low, informing him that the survey party left for Yosemite on September 28, 1864. Governor's Office Papers (GP2:101d), California State Archives.