U.S. EPA's publication "Compilation of Air Pollutant Emission Factors ("AP-42"): Fifth Edition, Volume 1: Stationary Point and Area Sources"
U.S. EPA's Factor Information and REtrieval (FIRE) system version 6.25
New for U.S. EPA - WebFIRE - an Internet based search application
U.S. EPA's TANKS 4.09d software
Landfill Gas Emissions Model (version 2.01)
NAICS and SIC industry codes
Process Tier Codes
Control Device Codes