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Dyfyniad Arddull ChicagoEmbleton, Clifford, and John Thornes. Process in Geomorphology. London: Edward Arnorld, 1979.
Dyfyniad MLAEmbleton, Clifford, and John Thornes. Process in Geomorphology. Edward Arnorld, 1979.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.