The Practice of Shaft Plumbing
File consists of an essay titled The Practice of Shaft Plumbing. Contains original diagrams
Potvin, J.P.
Levack Mine
File consists of an essay titled Levack Mine. Contains original blueprints and photographs
Johnston, W.G.
The Frood Stobie
File consists of an essay titled The Frood Stobie. Contains original diagrams
Dickhout, M.H.
Chilean Nitrate Industry
File consists of an essay titled Chilean Nitrate Industry. Contains original diagrams
Green, C.S.
Detachable Drill Bits
File consists of an essay titled Detachable Drill Bits.
Gilchrist, W.M.