Cite

Map of North America : reduced from map on scale of 1:5,000,000 / compiled by the U.S. Geological Survey.

MLA

Geological Survey (U.S.). Map of North America : reduced from map on scale of 1:5,000,000 / compiled by the U.S. Geological Survey.. BRBL_00371. 1912. https://collections.library.yale.edu/catalog/15827278.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00371"])(1912)[Map of North America : reduced from map on scale of 1:5,000,000 / compiled by the U.S. Geological Survey.]. https://collections.library.yale.edu/catalog/15827278.