Cite

[Insurance maps of Wilmington, Delaware].

MLA

Company, Sanborn Map. [Insurance Maps of Wilmington, Delaware]. [Sanborn Map Company], 0AD. https://collections.library.yale.edu/catalog/16387370.

APA, 6th edition

Company, S. M. (0 C.E.). [Insurance maps of Wilmington, Delaware]. [Fire insurance maps]. [Sanborn Map Company], https://collections.library.yale.edu/catalog/16387370.