Coalbed Methane Association of Alabama 

Coalbed Methane Outreach Program – EPA

International Center For Sustainable Development

US Geological Survey

American Association of Petroleum Geologist

Independent Petroleum Association of America

Rocky Mountain Association of Geologists

Canadian Society for Unconventional Gas

Independent Oil and Gas Association of West Virginia

Texas Independent Producers and Royalty Owners

Methane to Markets Partnership 

Rigzone

Oil and Gas Journal

Oil and Gas Investor

Jackson Hole Center for Global Affairs

Energy Information Agency

Humble Geochemical Services

Petroleum Technology Transfer Council

Gas Research Institute

Texas Independent Producers and Royalty Owners Association

AAPG

SPE

Engineering Conversion Factors

A Dictionary of Units