MLA

Geological Survey (U.S.). Map of Connecticut / prepared by the U.S. Geological Survey in co-operation with the State of Connecticut.. BRBL_00467. 1893. https://collections.library.yale.edu/catalog/15654742.

APA, 6th edition

Geological Survey (U.S.). (["BRBL_00467"])(1893)[Map of Connecticut / prepared by the U.S. Geological Survey in co-operation with the State of Connecticut.]. https://collections.library.yale.edu/catalog/15654742.