Geographic distribution and grade of metallic and nonmetallid minerals. Show subsurface stratigraphic information for certain oil and gas fields and of other areas of hydrocarbon potential. Show the area of certain oil and gas fields. In addition, maps show surface geology and subsurface stratigraphy and geologic structure. USGS topographic maps include physical features such as elevations, mountains, lakes, rivers, buildings, and transportation routes.
Coverage is for the United States including U.S. territories and possessions.
These maps are indexed in Index to Topographic and Other Map Coverage which is arranged by state, with a separate index for U.S. territories. This index can be found at the Government Documents desk on the second floor or in the Map Room. When requesting these maps, note the state and quadrangle name. These maps are indexed in Index to Intermediate Scale Mapping which is in the Map Room. The Map Room has the latest editions of these charts.