EPA Landfill Methane Outreach Program (LMOP) - http://www.epa.gov/lmop/

Energy Information Administration (EIA) - http://www.eia.doe.gov/fuelrenewable.html

Energy Efficiency and Renewable Energy Network - http://www.eren.doe.gov/

National Renewable Energy Laboratory - http://www.nrel.gov/

Database of State Incentives for Renewable Energy (DSIRE) - http://www.dsireusa.org/

United Kingdom Biogas Association - http://www.biogas.org.uk/

Solid Waste Services - http://www.theitgroup.com/

Solid Waste Association of North America (SWANA) - http://www.swana.org/

Journal for Municipal Solid Waste Professionals - http://www.forester.net/msw.html

SCS Engineers - http://www.scseng.com/

Hy-Bon Engineering Company - http://www.hy-bon.com/landfill.htm