Pittsburgh Coal Bed Original Resources by County in Pennsylvania, Ohio, West Virginia, and Maryland

This dataset is a polygon coverage of counties limited to the extent of the Pittsburgh coal bed resource areas and attributed with original resource values (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.本数据集为限定于匹兹堡煤层资源区范围的县级多边形覆盖数据集，其属性为按照《美国地质调查局通报891（USGS Circular 891）》所述汇总报告分类标准划定的原始资源量（单位：百万短吨）。本数据集系由《美国地质调查局专业论文集1625-C（Professional Paper 1625-C）》其他章节中的详细地质覆盖数据经概化处理后所得。