1806 Lewis, Meriwether, and Clark, William.
"Map of part of the continent of North America...as corrected by the celestial observations of Messr. Lewis & Clark
during their tours of discovery in 1805". [Copied from Lewis & Clark's map by N. King for the War Department of U.S., between 1807 and 1808.]
Portion of larger map shown here includes present day Montana.
Boston Athenæum.

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