Cite

An accurate map of the country round Boston in New England ...

MLA

An Accurate Map of the Country Round Boston in New England ... A. Hamilton, 1776. https://collections.library.yale.edu/catalog/15654584.

APA, 6th edition

An accurate map of the country round Boston in New England ... (1776). [Maps]. A. Hamilton, https://collections.library.yale.edu/catalog/15654584.