2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the vertical component of the total field intensity of the Earth's ma... National Atlas of the United States.
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2010. National Geophysical Data Center. This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic... National Atlas of the United States.
2010. National Geophysical Data Center. This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Fie... National Atlas of the United States.
1999. Geological Survey (U.S.). This line shapefile portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the i... Geological Survey (U.S.).
1906. United States. General Land Office. Compiled by R.H. Morton.; Revised and lettered by I.F. Berthrong.; S Doc 194 59 2.; Andrew B. Graham Co., photo-lithographers, Washington, D.C.; Sh... Dept. of the Interior, General Land Office (Washington, D.C).
1922. Mulford, John C. Includes location map.; Map no. 20266. 18 x 25 Centimeters Scale approximately 1:633,600 General Map Collection. U.S. Reclamation Service (Washington, D.C).
57. Montana
1909. Rand McNally and Company. Relief shown by hachures and spot heights.; Shows Indian reservations, military reservations, counties, national forests, railroads, and township g... Rand, McNally & Co (Chicago), 1909.
1876. Geological Survey (U.S.), cartographer. Little Bighorn, Battle of the, Mont., 1876--Maps.
1897. 1 map : col. ; 43 x 62 cm. Contour interval 20 ft.
1879. United States. General Land Office. Relief shown by hachures.; Shows Indian reservations with dates established.; Gives longitude west from Washington and Greenwich.; No acc. number. ... General Land Office.