Final unioned polygons for the Deserado coal area, northwest Colorado (des*fing)

These are shape files of final unioned polygon coverages used to calculate coal resources of the B and D coal zones, Lower White River coal field, Deserado assessment...本批数据为最终合并多边形覆盖数据集的形状文件（shapefile），用于计算德塞拉多评估所涉下怀特河煤田B、D煤区的煤炭资源量……