Cite

Reconnaissance map of northeastern portion of Seward Peninsula Alaska / U.S. Geological Survey ; Alfred H. Brooks, geologist in charge ; D.C. Witherspoon, topographer ; C.E. Hill, field assistant.

MLA

Geological Survey (U.S.). Reconnaissance map of northeastern portion of Seward Peninsula Alaska / U.S. Geological Survey ; Alfred H. Brooks, geologist in charge ; D.C. Witherspoon, topographer ; C.E. Hill, field assistant.. BRBL_00634. 1907. https://collections.library.yale.edu/catalog/15821767.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00634"])(1907)[Reconnaissance map of northeastern portion of Seward Peninsula Alaska / U.S. Geological Survey ; Alfred H. Brooks, geologist in charge ; D.C. Witherspoon, topographer ; C.E. Hill, field assistant.]. https://collections.library.yale.edu/catalog/15821767.