Cite

Map of Arizona or the Gadsen Purchase with the position of its silver mines as now worked 1859

MLA

Map of Arizona or the Gadsen Purchase with the Position of Its Silver Mines as Now Worked 1859. 0AD. https://collections.library.yale.edu/catalog/2014095.

APA, 6th edition

Map of Arizona or the Gadsen Purchase with the position of its silver mines as now worked 1859. (0 C.E.). [Maps]. https://collections.library.yale.edu/catalog/2014095.