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Dyfyniad Arddull ChicagoDomingo, Vernon, and Harm J De Blij. Guide to Accompany Physical Geography of the Global Environment. second edition. New York: John Wiley, 1996.
Dyfyniad MLADomingo, Vernon, and Harm J De Blij. Guide to Accompany Physical Geography of the Global Environment. second edition. John Wiley, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.