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Map for the Territory of Montana with portions of the adjoining territoriesshowing the gulch or placer diggings actually worked and districts where quartz (gold and silver) lodes have been discovered to January 1st 1865cartographic materialPublished 1865
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Map of Oregon Washington Idaho and part of Montanacartographic materialby Mitchell, S. Augustus (Samuel Augustus), 1792-1868
Published 1867 -
Colton's map of Oregon Washington Idaho British Columbia & Montanacartographic materialby Colton, J. H. (Joseph Hutchins), 1800-1893
Published 1860