Context

Context of A map of part of the continent of North America ... : compiled from the information of the best informed travellers through that quarter of the globe in which the Missouri Jefferson's Lewis's & the upper part of Clark's river and the lower part of the Columbia river is partially corrected by celestial observation, from the junction of the Missouri and Mississippi to the entrance of the Columbia into the Pacific Ocean in longitude 47057ʹ west of Washington City and 124057ʹ W. of Greenwich and in latitude 46019ʹ11ʺ north, shewing Lewis & Clark's rout over the Rocky Mountains in 1805 on their rout to the Pacific from the United States.
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