EPA – Technology Transfer Network - http://www.epa.gov/ttn/emc/

EPA – Laws & Regulations - http://www.epa.gov/air/oaqps/permits/requirem.html

Air & Waste Management Association - http://www.awma.org/

Source Evaluation Society - http://www.sesnews.org/

Active Set - http://activeset.org/

EPRI – www.epri.com