1941
Montana. State Highway Commission.
1:127k
1967
Shane, Ralph M.
1943
United States. Office of War Information
1:1m
1941
Montana. State Highway Commission.
1:127k
1938
Lindgren Brothers
1875
Ludlow, William
1:760k
1881
Heubach, Emil
1:750k
1900
U.S. General Land Office
1:760k
1874
Asher & Adams
1:1m
1882
Cram, George Franklin
1:2m