Thayer's map of the Leadville mines, California mining district, Lake County, Colorado, township 9, south ranges 79 and 80 west / H.L. Thayer ; compiled from the United States surveys and county records.
MLA
Thayer, H. L. Thayer's Map of the Leadville Mines, California Mining District, Lake County, Colorado, Township 9, South Ranges 79 and 80 West / H.L. Thayer ; Compiled from the United States Surveys and County Records. H.L. Thayer, 0AD. https://collections.library.yale.edu/catalog/15818461.
APA, 6th edition
Thayer, H. L. (0 C.E.). Thayer's map of the Leadville mines, California mining district, Lake County, Colorado, township 9, south ranges 79 and 80 west / H.L. Thayer ; compiled from the United States surveys and county records. [Maps]. H.L. Thayer, https://collections.library.yale.edu/catalog/15818461.
