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.
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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.
1916. Geological Survey (U.S.). Relief shown by contours, spot heights and bathymetric isolines.; Title in lower right corner: Portland and vicinity; at head of map: Topography.; ... The Survey (Washington, D.C).
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.).
1832. Fenner, Sears & Co., Hinton, Isaac Taylor, 1799-1847, and Simpkin, Marshall and Co. Relief shown by hachures. 1 map; 35 x 25 cm.
1839. Burr, David H., 1803-1875. Detailed map showing relief by hachures, drainage, township and county boundaries, cities and towns, canals, road, and railroads. From his The Amer... (London], ).
1896. Bates, Waldron. Relief shown by contours.; "Topography and hydrography adapted from the map of Mount Desert Island issued by hte United States Coast and Geodetic S... Geo. W. Stadley & Co (Boston, Mass).
1893. Geo. H. Walker & Co. Cover title: Latest map of the coast of Maine, eastern part.; Cycling routes shown in red. 52 x 78 centimeters Scale approximately 1:225,000 Genera... The Company (Boston, Mass), 1893.
1893. Geo. H. Walker & Co. Oriented with north to the upper right.; Cycling routes shown in red.; Cities/towns and counties are labeled. 51 x 77 Centimeters, on sheet 57 x 81... , 1993.
2004. National Atlas of the United States. This polygon shapefile portrays county level data for the fiscal-year-2004 National Fire Plan - Hazardous Fuels Reduction Program. The purpose of t... National Atlas of the United States.