Cite

Reconnaissance map of the Lower Kuskokwim region, Alaska / U.S. Geological Survey ; Alfred H. Brooks, Geologist in charge of division, topography by A.G. Maddren, R.H. Sargent and W.S. Post.

MLA

Geological Survey (U.S.). Reconnaissance map of the Lower Kuskokwim region, Alaska / U.S. Geological Survey ; Alfred H. Brooks, Geologist in charge of division, topography by A.G. Maddren, R.H. Sargent and W.S. Post.. BRBL_00633. 1921. https://collections.library.yale.edu/catalog/15821759.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00633"])(1921)[Reconnaissance map of the Lower Kuskokwim region, Alaska / U.S. Geological Survey ; Alfred H. Brooks, Geologist in charge of division, topography by A.G. Maddren, R.H. Sargent and W.S. Post.]. https://collections.library.yale.edu/catalog/15821759.