Map of the United States showing routes of the principal explorers from 1501 to 1844 : whose work had an important bearing on the settlement of the country and the fixing of its successive boundaries
Published in: Boundaries, areas, geographic centers and altitudes of the United States and the several states / Edward M. Douglas. Washington : Government Printing Office, 1923. Geological Survey Bulletin 689.; "Bulletin 669, Plate II." 19 x 29 centimeters Scale [1:16,473,600] General Map Collection
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