Shaft-sinking practices and costs /
by E.D. Gardner and J. Fred Johnson.

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Item Link Original Source
Full view   University of Illinois at Urbana-Champaign
Full view   NO357 The Ohio State University
Full view   NO358 The Ohio State University
Full view   NO359 The Ohio State University
Full view   NO360-364 The Ohio State University
Full view   NO365 The Ohio State University