R. L. Polk & Co.'s map of Alaska and Yukon Territory.
MLA
R. L. Polk & Co.'s Map of Alaska and Yukon Territory. R. L. Polk and Co., 0AD. https://collections.library.yale.edu/catalog/15821785.
APA, 6th edition
R. L. Polk & Co.'s map of Alaska and Yukon Territory. (0 C.E.). [Maps]. R. L. Polk and Co., https://collections.library.yale.edu/catalog/15821785.