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Industry Links:

• www.ita-aites.org (International Tunnelling Association)
• www.tunnelcanada.ca (Tunnelling Association of Canada)
• www.retc.org/index.cfm (Rapid Excavation and Tunnelling Conference) 
• www.auca.org (American Underground-Construction Association)
• www.societaitalianagallerie.it (Italian Tunnelling Association)
• www.britishtunnelling.org (British Tunnelling Society)
• www.civil.uwaterloo.ca/catt/ (Centre for Advancement of Trenchless Technologies)
• http://www.tucss.org.sg (Tunnelling and Underground Construction Society of Singapore)