Knobloch outcrop, Southern Montana, 1999 National Coal Resource Assessment (knocg.shp)
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资源简介：
This ArcView shape file contains a line representation of the Knobloch coal bed outcrop or contact with clinker in the Ashland coalfield as defined in the USGS National Coal Resource Assessment (NCRA) project. This theme was created specifically for the National Coal Resources Assessment in the Northern Rocky Mountains and Great Plains Region.
创建时间：
1999-01-01
