Digital Commonwealth

MLA

U.S. Coast and Geodetic Survey. Boston Harbor, Massachusetts. 1906. Web. 22 Feb 2019. <https://www.digitalcommonwealth.org/search/commonwealth-oai:z029pk702>.

APA

U.S. Coast and Geodetic Survey. (1906). Boston Harbor, Massachusetts [Map]. Retrieved from https://www.digitalcommonwealth.org/search/commonwealth-oai:z029pk702

Chicago

U.S. Coast and Geodetic Survey. "Boston Harbor, Massachusetts." Map. 1906. Digital Commonwealth, https://www.digitalcommonwealth.org/search/commonwealth-oai:z029pk702 (accessed February 22, 2019).