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by Powell, John Wesley, 1834-1902
Published 1903 -
1830-1870 western emigrant trails major trails cutoffs and alternatescartographic materialby Bier, James Allen
Published 1993 -
Colton's map of Oregon Washington Idaho British Columbia & Montanacartographic materialby Colton, J. H. (Joseph Hutchins), 1800-1893
Published 1860