Envisaging the West: Thomas Jefferson and the Roots of Lewis and Clark

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A new map of North America

Mapmaker, Robert Sayer, 1750?

A new map of North America, with the British, French, Spanish, Dutch & Danish dominions on that great continent; and the West India Islands, done from the latest geographers, with great improvements from the Sieurs d'Anville & Robert

Library of Congress, Geography and Map Division.