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Thompson, Gilbert, 1839-1909
Chapman, R. H. (Robert Hollister), 1868-1920
1
Douglas, Edward Morehouse, 1855-1932
1
Geological Survey (U.S.)
1
Lloyd, W. J. (Topographer)
1
collection
Maps of North America
1
place
Helena (Mont.)
1
Helena Region (Mont.)
1
genre
Maps
1
Topographic maps
1
publisher
x
U.S. Geological Survey
division
Map Division
1
type
cartographic
1
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Montana, Helena special map