Cite

Rand, McNally & Co.'s new geological map of Colorado.

MLA

McNally, Rand, and Company. Rand, McNally & Co.'s New Geological Map of Colorado. Rand McNally, 0AD. https://collections.library.yale.edu/catalog/15818450.

APA, 6th edition

McNally, R., & C. (0 C.E.). Rand, McNally & Co.'s new geological map of Colorado. [Maps]. Rand McNally, https://collections.library.yale.edu/catalog/15818450.