Cofnodi Dyfyniadau
Dyfyniad APA
National Research Council (U.S.). Committee on Hardrock Mining on Federal Lands & ebrary, Inc. (1999). Hardrock mining on federal lands. National Academy Press.
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Dyfyniad Arddull Chicago
National Research Council (U.S.). Committee on Hardrock Mining on Federal Lands and Inc ebrary. Hardrock Mining on Federal Lands. Washington, D.C. ; [Great Britain]: National Academy Press, 1999.
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Dyfyniad MLA
National Research Council (U.S.). Committee on Hardrock Mining on Federal Lands and Inc ebrary. Hardrock Mining on Federal Lands. National Academy Press, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.