Columbia subject headings:
Marias Pass (Mont.)
Railroads--Montana--Surveying.
Stevens, Isaac Ingalls, 1818-1862.
Stevens, John F. (John Frank), 1853-1943.
Harvard subject headings:
Marias Pass (Mont.)
Railroads--Montana--Surveying.
Stevens, Isaac Ingalls, 1818-1862
Stevens, John F. (John Frank), 1853-1943.
Princeton subject headings:
Marias Pass, Rocky Mountains.
Stevens, Isaac Ingalls, 1818-1862.
Stevens, John, F. b. 1853.