Safe practice in using wire ropes in mines

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Príomhchruthaitheoirí: Kudlich, R. H., Hood, O. P. (Údar)
Údar corparáideach: Department of the Interior. Bureau of Mines
Formáid: LEABHAR
Teanga:English
Foilsithe / Cruthaithe: Washington : Government Printing Office, 1919.
Sraith:Technical Paper ; 237
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