Bond, Frank, 1856-1940Published 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 centimetersJPEGUMN_ALMA:9940090240001701engU.S. Geological Survey (Washington, D.C)PublicMap 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 boundariesMapsUniversity of Minnesota