The Oxford book of invertebrates. Protozoa, sponges, coelenterates, worms, molluscs, echinoderms, and arthropods (other than insects)
Nichols, D.; Cooke, J.A.L. (1971). The Oxford book of invertebrates. Protozoa, sponges, coelenterates, worms, molluscs, echinoderms, and arthropods (other than insects). Oxford University Press: Oxford. ISBN 978-0199100088. 218 pp.
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