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Interactive atlas of historical coal mine maps in Pennsylvania
Maps - Pennsylvania DEP
WESTERN PENNSYLVANIA COALFIELDS - coalcampusa.com
Bituminous coal mine maps of Pennsylvania
Pennsylvania Mine Map Atlas - Tutorial
Coal In Pennsylvania - Pennsylvania Mines and Mining - Library …
Mines and Company Towns - IUP - Indiana University of Pennsylvania
PA Mining History - Pennsylvania DEP
How DEP’s Mining Program Brought Thousands of Old, Decaying Mine Maps …
ArcGIS Web Application