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Evolution in Upper Jurassic Ammonites

Bernhard Ziegler
Evolution
Vol. 13, No. 2 (Jun., 1959), pp. 229-235
DOI: 10.2307/2405875
Stable URL: http://www.jstor.org/stable/2405875
Page Count: 7
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Evolution in Upper Jurassic Ammonites
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