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Dyfyniad Arddull ChicagoPage, Talbot. Conservation and Economic Efficiency: An Approach to Materials Policy. Baltimore: Published for Resources for the Future by the Johns Hopkins University Press, 1977.
Dyfyniad MLAPage, Talbot. Conservation and Economic Efficiency: An Approach to Materials Policy. Published for Resources for the Future by the Johns Hopkins University Press, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.