This polygon shapefile represents the geographic extent of USGS 1:100,000 topographic maps (30- by 60-minute quadrangles) for the coterminous U.S. forty-eight states and District of Columbia. This layer is part of the 2014 ESRI Data and Maps collection for ArcGIS 10.2. USGS 1:100,000 Topographic Quadrangle Series Index provides quadrangle name, identification number, publication data, and map coverage by state for each quadrangle. This medium-scale index grid can be a handy visual reference for regional displays. ESRI and U.S. Geological Survey. (2014). USGS 1:100,000 Topographic Quadrangle Series Index, 1992. ESRI. Available at: http://purl.stanford.edu/nc393kd0487