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Evolutionary Transition from Ammonite Subprionocyclus to Reesidites- Punctuated or Gradual?
Philip D. Gingerich
Vol. 32, No. 2 (Jun., 1978), pp. 454-456
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2407612
Page Count: 3
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