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ASCE - American Society of Civil Engineers
http://www.asce.org/

ASTM - American Society for Testing and Materials
http://www.astm.org/

AISE - Association of Iron and Steel Engineers
http://www.aist.org/

NAAMM - National Association of Architectural Metal Manufacturers
http://www.naamm.org/

SDI - Steel Deck Institute
http://www.sdi.org/

Steel Joist Institute
http://www.steeljoist.com/