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
List of Source Classification Codes (SCC)
Process Tier Codes
Control Device Codes