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Dyfyniad Arddull ChicagoEncyclopaedia of Climate and Weather (v.2). Oxford: Oxford University Press, 1996.
Dyfyniad MLAEncyclopaedia of Climate and Weather (v.2). Oxford University Press, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.