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Dyfyniad Arddull ChicagoHamann, S.D. Physico-chemical Effects of Pressure. London: Butterworth Scientific Publications, 1957.
Dyfyniad MLAHamann, S.D. Physico-chemical Effects of Pressure. Butterworth Scientific Publications, 1957.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.