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- 72186424 contributor B2123905.
- 72186424 created "1970.".
- 72186424 date "1970".
- 72186424 date "1970.".
- 72186424 dateCopyrighted "1970.".
- 72186424 extent "xv, 126 p.".
- 72186424 isPartOf "Canada. Dept. of Energy, Mines and Resources. Mines Branch. Information circular 256".
- 72186424 isPartOf "Canada. Mines Branch (1950- ). Information circular 256.".
- 72186424 issued "1970".
- 72186424 issued "1970.".
- 72186424 language "eng fre".
- 72186424 language "eng".
- 72186424 publisher "Ottawa, Dept. of Energy, Mines and Resources, Mines Branch,".
- 72186424 subject "622/.08 s 624/.19/028".
- 72186424 subject "Boring machinery.".
- 72186424 subject "TN26 .A3527 no. 256 TA815".
- 72186424 subject "Tunneling Equipment and supplies.".
- 72186424 title "The operation of mechanical tunnel-boring machines in Canada [by] T. W. Verity.".
- 72186424 type "text".