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