Upper Freeport Coal Bed Resource Areas in Pennsylvania, Ohio, West Virginia, and Maryland

This dataset is the digital compilation of geologic and resource maps provided mostly by State geologic surveys and depicts the projected area of occurrence of the...本数据集为地质与资源地图的数字化汇编，数据主要由州地质调查局（State Geologic Surveys）提供，用于呈现……的预测赋存区域。