Established by an Act of Congress in 1879 and charged with responsibility for "classification of the public lands,
and examination of the geological structure, mineral resources, and products of the national domain," the U. S. Department
of the Interior's Geological Survey has been the Nation's principal source of information about its physical resources
the configuration and character of the land surface, the composition and structure of the underlying rocks, and the quality,
extent, and distribution of water and mineral resources.
The following web pages are selected from the huge USGS database highlighting Montana railroads.
Click the numbered region on the map above to be directed to links to quadrangle