A printed map of the western portions of North America. The map includes an inset of the North Pacific Ocean and the adjacent coasts and islands. A facsimile engraving of a medal "struck at Boston in 1787 on occasion of the departure of the vessels Columbia and Washington for the northwest coast of America," is included at the lower left corner of the map. Relief is shown by hachures.
The map was originally published in: "Memoir, Historical and Political, on the Northwest Coast of North America, and the Adjacent Territories Illustrated by a Map and a Geographical View of Those Countries." Greenhow, Robert. Washington, D.C.: Blair and Rives, Printers, 1840. Senate executive document (United States. Congress. Senate); 26th Congress, 1st Session, no. 174.