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Dyfyniad Arddull ChicagoSpiegel, Leopold. Chemical Constitution and Physiological Action. New York: Van Nostrand, 1915.
Dyfyniad MLASpiegel, Leopold. Chemical Constitution and Physiological Action. Van Nostrand, 1915.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.