The 2018 North American Tunneling (NAT) conference organizing committee has issued a call for papers which are due in by June 30^th  2017. NAT 2018 will be taking place in Washington, D.C. from June 24^th -27^th  2018. Prospective authors are invited to submit an abstract of 100 words or less on a topic relevant to the theme which is ‘Tunneling a Capital Idea’ using the online submission form. Authors will be notified of acceptance in August 2017. For further information please visit http://www.natconference.com/index.cfm/conference/authors/abstract-submission/. 23/17.