Inland Waters of Southern Africa: An Ecological Perspective. Eds. B. R. Allanson,R. C. Hart,J. H. O'Keeffe and R. D. Robarts — Monographiae Biologicae 64. — 458 pp., figures,tables. Dordrecht: Kluwer Academic Publishers Group 1990. ISBN 0-7923-0266-4. Dfl. 300.-, US £ 159.-, UK £ 100.— |