Use of algae for monitoring rivers :
proceedings of an international symposium held at the Landesamt für Wasser und Abfall Nordrhein-Westfalen, Düsseldorf, Germany, 26-28 May 1991 /
sponsored by Deutsche Gesellshaft für Limnologie, supported by Bioindicator Commission, International Union of Biological Sciences ; edited by B.A. Whitton, E. Rott and G. Friedrich.

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