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Dyfyniad Arddull ChicagoGill, Robin. Chemical Fundamentals of Geology and Environmental Geoscience. Third edition. Chichester, West Sussex: John Wiley & Sons, Inc., 2015.
Dyfyniad MLAGill, Robin. Chemical Fundamentals of Geology and Environmental Geoscience. Third edition. John Wiley & Sons, Inc., 2015.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.