Cite

United States contour map / Department of the Interior, U.S. Geological Survey.

MLA

Geological Survey (U.S.). United States contour map / Department of the Interior, U.S. Geological Survey.. BRBL_00408. [1916]. https://collections.library.yale.edu/catalog/15827367.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00408"])([1916])[United States contour map / Department of the Interior, U.S. Geological Survey.]. https://collections.library.yale.edu/catalog/15827367.