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By "Jeffries, Richard Peter Spencer "
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The subphylum Calcichordata (Jeffries1967) primitive fossil Chordates with Echinoderm affinities
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By: Jeffries, Richard Peter Spencer
Type: Article
In: Bulletin of the British Museum (Natural History) Geology
Volume: 16
Series:
Issue: 6
Date: 1968-07-02
Page Range: 241--340
Publication Info: London, BM(NH),
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