Cite

Insurance maps of New London, including Groton, Connecticut.

MLA

Sanborn Map Company, issuing body. Insurance Maps of New London, Including Groton, Connecticut. 1921. https://collections.library.yale.edu/catalog/11205719.

APA, 6th edition

Sanborn Map Company, issuing body. (1921). Insurance maps of New London, including Groton, Connecticut. [Atlases, Cadastral maps, Connecticut, Fire insurance maps, Groton, local, New London]. https://collections.library.yale.edu/catalog/11205719.