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The record of early 'Scaphopoda' (?Mollusca)re-evaluated

Yochelson, Ellis L. 2004. "The record of early "Scaphopoda" (?Mollusca)re-evaluated." Annales Naturhistorishe Museum, Wien, 106A 13–31.
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Life Span of Mollusca (numbers 43-54)

Roper, Clyde F. E. 1972. "Life Span of Mollusca (numbers 43-54)." In Biological Data Book. Altman, P. L. and Dittmer, D. S., editors. 234–235. Federation of ...