Cite

Topographic reconnaissance map of Innoko-Iditarod region, Alaska / Geological Survey.

MLA

Geological Survey (U.S.). Topographic reconnaissance map of Innoko-Iditarod region, Alaska / Geological Survey.. BRBL_00633. 1921. https://collections.library.yale.edu/catalog/15821749.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00633"])(1921)[Topographic reconnaissance map of Innoko-Iditarod region, Alaska / Geological Survey.]. https://collections.library.yale.edu/catalog/15821749.