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Dyfyniad Arddull ChicagoHeumann, William L. Industrial Air Pollution Control Systems. New York: McGraw-Hill, 1997.
Dyfyniad MLAHeumann, William L. Industrial Air Pollution Control Systems. New York: McGraw-Hill, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.