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  1. PA Abandoned Mines - Millersville University of Pennsylvania

  2. Pa. sinkhole: Underground voids from mines pose danger - WHYY

  3. Underground voids from abandoned mines pose danger to …

  4. Shapiro Administration and U.S. Department of Interior ... - PA.GOV

  5. Where there's smoke: Pennsylvania's Abandoned Coal Mines

  6. Interactive atlas of historical coal mine maps in Pennsylvania

  7. Abandoned Mine Reclamation in Pennsylvania - ArcGIS StoryMaps

  8. Bureau of Abandoned Mine Reclamation - Pennsylvania DEP

  9. Federal funding targets Pennsylvania's abandoned coal mines

  10. How DEP’s Mining Program Brought Thousands of Old ... - Pennsylvania