Digital Geologic Map of the Fredericksburg Quadrangle, Virginia (NPS, GRD, GRE, FRSP)

The Digital Geologic Map of the Fredericksburg Quadrangle, Virginia is comprised of GIS data layers, two ancillary GIS tables, a Windows Help File with ancillary map...弗吉尼亚州弗雷德里克斯堡幅数字地质图由地理信息系统（Geographic Information System, GIS）数据图层、两个辅助GIS数据表、附带辅助地图的Windows帮助文件及……组成。