Cite

Smith-Brooks' map of Colorado.

MLA

Co, Smith-Brooks. Smith-Brooks' Map of Colorado. Smith-Brooks Printing Co., 0AD. https://collections.library.yale.edu/catalog/15818426.

APA, 6th edition

Co, S.-B. (0 C.E.). Smith-Brooks' map of Colorado. [Maps]. Smith-Brooks Printing Co., https://collections.library.yale.edu/catalog/15818426.