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Dyfyniad Arddull ChicagoLuard, David Evan Trant. The Control of the Sea-bed; a New International Issue. London: Heinemann, 1974.
Dyfyniad MLALuard, David Evan Trant. The Control of the Sea-bed; a New International Issue. Heinemann, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.