20th National Conference Tunnelling Technology and the EnvironmentThe Tunnelling Association of Canada (TAC) organizes the 20th national conference and exhibition "Tunnelling Technology and the Environment" on 27th-28th October, 2008 at the Sheraton Fallsview Hotel in Niagara Falls in Ontario, Canada.Interested authors are invited to submit a 150 to 300 word abstract on or before March 31, 2008. Topics should be in keeping with the conference theme of tunnelling technology and the environment. Draft papers for those selected will be required by 30th June with a final paper completed by 31st August.Submissions should be made to Steve Skelhorn via e-mail to tac2008@mcnallycorp.com and must include authors details, contact information and affiliations. Selected authors will be notified in writing. Visit www.tunnelcanada.ca 14/08.