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Dyfyniad Arddull ChicagoSylvester-Bradley, P. C. Species Concept in Palaeontology. [1st ed.]. London, 1956.
Dyfyniad MLASylvester-Bradley, P. C. Species Concept in Palaeontology. [1st ed.]. 1956.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.