00000nam 2200000za 4500 9.840583 CaOODSP 20221107151859 cr ||||||||||| 170728s1968 oncabd ob f000 0 eng d CaOODSP eng n-cn--- n-cn-ns M38-8/72E-PDF M38-8/72 Tunnelling in Canada [electronic resource] / M.A. Twidale and A. Ignatieff. Rapid development of longwall retreating in the submarine area of the Sydney coalfield of Nova Scotia / L. Frost and H. Zorychta. Rapid development of longwall retreating in the submarine area of the Sydney coalfield of Nova Scotia Ottawa : Queen's Printer, 1968. p. 3-20, 13 p. : charts, ill., map Reprint series ; RS 72 Cover title. "Reprinted from the Proceedings of the I.M.E. Symposium on Shaft Sinking and Tunnelling, Olympia, London, July 15-17, 1959." "Reprinted from the International Conference on Rapid Excavation in Coal Mines, INICHAR, Liege (Belgium), 1963. (A French version is issued as Reprint Series RS 73)." Historical publication digitized from print 2017 [by Natural Resources Canada]. Includes bibliographical references. gccst Mining industry gccst Coal Twidale, M. A. Canada. Natural Resources Canada. Canada. Department of Energy, Mines and Resources. Canada. Mines Branch. Exploitation rapide d'une taille rabattante dans le district sous-marin de Sydney en Nouvelle-Écosse (CaOODSP)9.840608 Reprint series - Dept. of Energy, Mines and Resources, Mines Branch ; RS 72 (CaOODSP)9.834843 PDF 26.48 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M38-8/M38-8-72-eng.pdf 300151