Delaware Basin

Railroad Commission of Texas:
Texas Commission on Environmental Quality:
Reeves County Appraisal District:
Culberson County Appraisal District:
Ward County Appraisal District:

Eagle ford shale

Railroad Commission of Texas:
Eagle Ford Shale:
Texas Commission on Environmental Quality:
Atascosa County Appraisal District:
Frio County Appraisal District:
La Salle County Appraisal District:
McMullen County Appraisal District:

Marcellus shale

Penn State University: College of Agricultural Sciences:
New York Department of Environmental Conservation (DEC):
Penn State Environmental and Energy Study Institute (EESI):
Penn State Institutes of Energy and the Environment (PSIEE):
West Virginia Department of Environmental Protection (DEP):
West Virginia Office of Oil and Gas:
Marcellus Shale Formation:

Niobrara formation

Colorado Oil and Gas Convention Commission:
Colorado Oil and Gas Association:
BLM Colorado:
Colorado Energy News:
Energy in Depth:
Industry Fracking Fluid Contents:

Utica shale

Ohio Environmental Protection Agency:
Ohio Department of Natural Resources:
Ohio Oil and Gas Energy Education Program:
Ohio Oil and Gas Association: