American Gas Association (AGA)
http://www.aga.org/

American Petroleum Institute (API)
http://api-ec.api.org/frontpage.cfm

American Society for Non-Destructive Testing (ASNT)
http://www.asnt.org

American Society of Mechanical Engineers (ASME)
http://www.asme.org/

Canadian Energy Pipeline Association (CEPA)
http://www.cepa.com/index.html

Gas Technology Institute (GTI)
http://www.igt.org/

Interstate Natural Gas Association of America (INGAA)
http://www.ingaa.org/

NACE International
http://www.nace.org/

National Energy Board (NEB)
http://www.neb-one.gc.ca/

National Transportation Safety Board (NTSB)
http://www.ntsb.gov/

Pigging Products & Services Association
http://www.ppsa-online.com

Pipeline Research Council International, Inc. (PRCI)
http://www.prci.com/

Southern Gas Association (SGA)
http://www.sgalink.org/

U.S. Department of Transportation (DOT)
http://ops.dot.gov/