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NASTT – North American Society for Trenchless Technology

www.trenchlessonline.com

June 12, 2008">June 12, 2008

ISTT – International Society for Trenchless Technology

Trenchless Technology Magazine

Underground Construction Magazine

www.oildompublishing.com/UC/uchome.html

ABRATT - Brazilian Association for Trenchless Technology

UNITRACC - Underground Infrastructure Training and Competence Center

www.unitracc.com

www.abratt.org.br/index.htm