Upper Freeport Coal Bed Original Resources by County in Pennsylvania, Ohio, West Virginia, and Maryland
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资源简介：
This dataset is a polygon coverage of counties limited to the extent of the Upper Freeport coal bed resource areas and attributed with original resources (millions of short tons) in aggregated reporting categories as described in USGS Circular 891. The file has been generalized from detailed geologic coverages found elsewhere in Professional Paper 1625-C.
创建时间：
2000-01-01
