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Dyfyniad Arddull ChicagoSittig, Marshall. Pollution Control in the Asbestos, Cement, Glass and Allied Mineral Industries. Park Ridge: N.J., Noyes Data Corporation, 1975.
Dyfyniad MLASittig, Marshall. Pollution Control in the Asbestos, Cement, Glass and Allied Mineral Industries. N.J., Noyes Data Corporation, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.