Coal In Pennsylvania Pennsylvania Mines and Mining ...
Sep 18, 2019· Bituminous coal mine maps of Pennsylvania. This set of maps was created by the WPA during the 1930''s to show the locations of known underground coal mines. These maps are based on 15minute topographic quadrangles, divided into nine sections. (For example, "Altoona 1" represents the northwest corner of the Altoona 15minute quadrangle. ...