Columbia subject headings:
Harvard subject headings:
Marcellus Shale.
Mine drainage.
Natural gas--United States
Princeton subject headings:
Acid mine drainage--Marcellus Shale--Evaluation--Congresses.
Coal mine waste--Marcellus Shale--Congresses.
Hydraulic fracturing--Evaluation--Congresses.
Natural gas--Marcellus Shale--Congresses.
Shale gas industry--Marcellus Shale--Congresses.