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Yoder, Robert L. Tentaculites attenuatus Hall and T.bellulus Hall : a redescription and interpretation of these species as dimorphs. Robert L.Yoder and Bernd-D.Erdtmann. In Journal of Paleontology, 1975, vol.49, no.2. Tulsa : Society of Economic Paleontologists and Mineralogists, 1975, Journal of Paleontology, 1975, vol.49, no.2.S.374-386, : .
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