Hyman, Libbie Henrietta
Invertebrates, Vol.5: Smaller coelomate groups chaetognatha, hemichordata, pogonophora, phoronida, ectoprocta, brachiopoda sipunculida the coelomate bilateria
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- McGraw-Hill Book Co., New York 1959
- 783
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Invertebrates-- Zoology
592 HYM-I.5