2007 Natural Gas Production and Taxation Rates by State
Drilling
history of the Marcellus Shale and the geology of the formation
http://www.dcnr.state.pa.us/topogeo/pub/pageolmag/pdfs/v38n1.pdf
Environmental Stewardship Fund - Purdon's Pennsylvania Statutes
Leased Acreage of State Forest Land (Pennsylvania Department of Conservation & Natural Resources)
2008 Pennsylvania Conservation & Natural Gas Conference Presentations & Handouts
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