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Easton, E. G. A revision of the 'acaecate' earthworms of the Pheretima group (Megascolecidae: Oligochaeta): Archipheretima, Metapheretima, Planapheretima, Pleionogasterz and Polypheretima / E. G. Easton. - London : [б. и.], 1979. - 126 p. - (Bull. British. Mus. (Nat. Hist.), ser. zool., v.35(1)). - Б. ц.
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