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Marcellus natural gas trend - Wikipedia
Marcellus Shale: Results Continue to Amaze Geologists
Marcellus Formation - Wikipedia
MarcellusGas.Org Home Page
USGS Estimates 214 trillion Cubic Feet of Natural Gas in …
Appalachian Basin Marcellus gas play - AAPG Wiki
The 5 Companies Dominating the Marcellus Shale Play
Forecast of economic gas production in the Marcellus Shale
Marcellus - Chesapeake Energy
Giant Fields of the Decade 2000–2010 - GeoScienceWorld