Cite

U.S.P.R.R. Explorations & Surveys War Department. Geological map of the country between San Diego and the Colorado River California. Prepared Int Office of P.R.R. Exp. & Surveys. by W. P. Blake

MLA

Blake, William P. U.S.P.R.R. Explorations & Surveys War Department. Geological Map of the Country between San Diego and the Colorado River California. Prepared Int Office of P.R.R. Exp. & Surveys. by W. P. Blake. 1855. https://collections.library.yale.edu/catalog/2015615.

APA, 6th edition

Blake, W. P. (1855). U.S.P.R.R. Explorations & Surveys War Department. Geological map of the country between San Diego and the Colorado River California. Prepared Int Office of P.R.R. Exp. & Surveys. by W. P. Blake [Lithographs, Planographic prints]. https://collections.library.yale.edu/catalog/2015615.