International Labour Office & ebrary, Inc. (2009). Safety and health in underground coalmines. International Labour Office.
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Dyfyniad Arddull Chicago
International Labour Office and Inc ebrary. Safety and Health in Underground Coalmines. Geneva: International Labour Office, 2009.
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Dyfyniad MLA
International Labour Office and Inc ebrary. Safety and Health in Underground Coalmines. International Labour Office, 2009.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.