Rio Negro—Rich Life in Poor Water, by M. Goulding, M. Leal Carvalho & E.G. Ferreira. SPB Academic Publishing bv., P.O. Box 97747, 2509 GC The Hague, The Netherlands: xii + 200 pp., with 32 figures and 18 tables, 24 × 16 × 1 cm, paper cover, US $35, 1988.

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