Lumbricidae (Annelida). With keys and descriptions
Gerard, B.M. (1964). Lumbricidae (Annelida). With keys and descriptions. Second edition. Synopses of the British Fauna, 6. Linnean Society of London: London. 58 pp.
Part of: Barnes, R.S.K.; Crothers, J.H. (Ed.) Synopses of the British Fauna. Linnean Society of London: London; New York. ISSN 0082-1101, more
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