International Tunneling Symposium - 7th Edition - Istanbul, Turkey
7th International Tunneling Symposium in Turkey Organized by Turkish Tunnel...CANCELLED - NAT2020 North American Tunneling Conference (Nashville - Tennessee)
Unfortunately, this event has been cancelled due to COVID-19. http://www.natconference.com/index.cfm/covid-19-updates1/
cover tunnel photo by: Matt Brown from London, England / CC BY
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