Cite

The Yellowstone National Park, via Northern Pacific Railway.

MLA

Brothers, Poole. The Yellowstone National Park, via Northern Pacific Railway. Poole Bros.?, 1900. https://collections.library.yale.edu/catalog/15818386.

APA, 6th edition

Brothers, P. (1900). The Yellowstone National Park, via Northern Pacific Railway. [Maps]. Poole Bros.?, https://collections.library.yale.edu/catalog/15818386.