Pittsburgh Coal Bed Remaining 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 remaining resource values 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域多边形覆盖数据，其附带的属性为按照《美国地质调查局通报891》（USGS Circular 891）所述的汇总报告分类下的剩余资源量数值。该数据集文件由《专业论文1625-C》其他章节中的详细地质覆盖数据经概化处理后生成。