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

APA Citation

Gardner, E. D. (Eugene Delos)., Johnson, J. Fred (John Frederick). (1932). Shaft-sinking practices and costs. Washington: U.S. G.P.O..

MLA Citation

Gardner, E. D. (Eugene Delos), b. 1885, and J. Fred (John Frederick) Johnson. Shaft-sinking Practices And Costs. Washington: U.S. G.P.O., 1932.

Warning: These citations may not always be complete (especially for serials).