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Whitton, B. A., E. Rott, and G. Friedrich (eds.): Use of algae for monitoring rivers: proceedings on an international symposium held at Landesamt für Wasser und Abfall Nordrhein- Westfalen, Düsseldorf, germany, 26 - 28 May 1991. illus 193 p. 4to. Broschiert. 60.99 (48819)
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