1886
1:250k
1941
Montana. State Highway Commission.
1:127k
1951
United States. Air Force
1:500k
1875
Ludlow, William
1:760k
1893
Union Pacific Railway Company.
1874
Asher & Adams
1:1m
1875
Cram Atlas Company
1:1m
1909
Rand McNally and Company
1:2m
1883
Cram, George Franklin
1:2m
1874
Asher & Adams
1:1m