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Dyfyniad Arddull Chicagoebrary, Inc, and Gerald V. Jergensen. Copper Leaching, Solvent Extraction, and Electrowinning Technology. Littleton, Colo.: Society for Mining, Metallurgy, and Exploration, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.