Powder River Basin boundary, 1999 Coal Resource Assessment (prbbndg.shp)
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资源简介：
This ArcView shapefile contains a polygon representing the boundary of the Powder River Basin based on a generalized contact of Cretaceous and Tertiary rocks. This theme was created specifically for the National Coal Resource Assessment in the Northern Rocky Mountains and Great Plains Region.
创建时间：
1999-01-01
