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Dyfyniad Arddull ChicagoClark, John R. Coastal Seas: The Conservation Challenge. Blackwell Science, 1998.
Dyfyniad MLAClark, John R. Coastal Seas: The Conservation Challenge. Blackwell Science, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.