MLA

Baldwin, and Company. Baldwin's Map of Mining Claims near Leadville, California Mining District, Lake Co. Colorado. Baldwin & Co., 0AD. https://collections.library.yale.edu/catalog/15818460.

APA, 6th edition

B., & C. (0 C.E.). Baldwin's map of mining claims near Leadville, California Mining District, Lake Co. Colorado. [Maps]. Baldwin & Co., https://collections.library.yale.edu/catalog/15818460.