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Dyfyniad Arddull ChicagoWellburn, Alan. Air Pollution and Climate Change: The Biology Impact. Harlow, England: Addison Wesley Longman, 1994.
Dyfyniad MLAWellburn, Alan. Air Pollution and Climate Change: The Biology Impact. Harlow, England: Addison Wesley Longman, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.