Cite

U.S.P.R.R. Exp. & Surveys. Cal. Geology Map 1. Geological map of the vicinity of San Francisco, prepared in office of P.R.R. Exp. & Surveys. By William P. Blake 1853

MLA

T. Sinclair's Lith., Philadelphia, and William P. Blake Pennsylvania. U.S.P.R.R. Exp. & Surveys. Cal. Geology Map 1. Geological Map of the Vicinity of San Francisco, Prepared in Office of P.R.R. Exp. & Surveys. By William P. Blake 1853. 0AD. https://collections.library.yale.edu/catalog/2015611.

APA, 6th edition

T. Sinclair's Lith., P., & Pennsylvania, W. P. B. (0 C.E.). U.S.P.R.R. Exp. & Surveys. Cal. Geology Map 1. Geological map of the vicinity of San Francisco, prepared in office of P.R.R. Exp. & Surveys. By William P. Blake 1853 [Lithographs, Planographic prints]. https://collections.library.yale.edu/catalog/2015611.