Cite

Map of Eldorado County / compiled, published, and copyrighted by Progressive Map Service.

MLA

Service, Progressive Map. Map of Eldorado County / Compiled, Published, and Copyrighted by Progressive Map Service. Progressive Map Service, 0AD. https://collections.library.yale.edu/catalog/15818682.

APA, 6th edition

Service, P. M. (0 C.E.). Map of Eldorado County / compiled, published, and copyrighted by Progressive Map Service. [Maps]. Progressive Map Service, https://collections.library.yale.edu/catalog/15818682.