Cite

Map of a part of Washington Territory lying east of the Cascade Mountains : to accompany report of Surveyor General.

MLA

Tilton, James. Map of a Part of Washington Territory Lying East of the Cascade Mountains : to Accompany Report of Surveyor General. General Land Office?], 1857. https://collections.library.yale.edu/catalog/15821629.

APA, 6th edition

Tilton, J. (1857). Map of a part of Washington Territory lying east of the Cascade Mountains : to accompany report of Surveyor General. [Maps]. General Land Office?], https://collections.library.yale.edu/catalog/15821629.