Map of the conterminous 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
Titre complet:Map of the conterminous 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
Date de publication:1983
Éditeur:United States. General Land Office.; Geological Survey (U.S.); Reston, Virginia : U.S. Geological Survey