Tunnelling in Canada.
Contributors: Twidale, M.A.; Ignatieff, A.; Frost, L.
Series: Canada Mines Branch Reprint Series -- 72
Publisher: s.n
Published: 1968
Place of publication: S.l
Language: eng
Other titles: Rapid Development of Longwall Retreating in the Submarine Area of the Sidney Coalfield of Nova Scotia.
Notes: 1