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Dyfyniad Arddull ChicagoBiological Science: Molecules to Man. New York: Houghton Mifflin, 1963.
Dyfyniad MLABiological Science: Molecules to Man. Houghton Mifflin, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.