Colorado Oil and Gas Conservation Commission
http://oil-gas.state.co.us

Colorado Oil and Gas Association
http://www.coga.org

Bureau of Land Management
http://www.blm.gov

Environmental Protection Agency
http://www.epa.gov

Strategic Center for Natural Gas
http://www.netl.doe.gov/scngo

Natural Gas Supply Association
http://www.ngsa.org

General topics in natural gas industry
http://www.naturalgas.org