Description: This layer presents the geographic extent of USGS 1:24,000 topographic maps (7.5- by 7.5-minute quadrangles) for the conterminous U.S. forty-eight states and District of Columbia. It provides quadrangle name, identification number, publication data, and map coverage by state for each quadrangle. This large-scale index grid is appropriate for display at more detailed scales.
Copyright Text: Esri; United States Geological Survey