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Sims, R. W. - Gerard, B. M.
Earthworms : keys and notes for the identification and study of the species / R. W. Sims and B. M. Gerard
London (etc.) : published for the Linnean society of London and the Estuarine and brackish-water sciences association by E. J. Brill/W. Backhuys, (1985)
Synopses of the British fauna (New series) ; 31