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By "Villoutreys, O De "
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Au sujet du genre Ptychoceras d'Orbigny (Ammonite)
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By: Villoutreys, O De
Type: Article
In: Bulletin du Muséum national d'histoire naturelle
Volume: 22
Series: 2
Issue: 1
Date: 1950-01
Page Range: 155--156
Publication Info: Paris, Imprimerie nationale, 1907-1971
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