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  1. 1
    Published 1976
    Subjects “...Aquatic ecology Technique Congresses....”
    Conference Proceeding Book
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    Principles and methods for determining ecological criteria on hydrobiocenoses : proceedings of the European Scientific Colloquium, Luxembourg, November 1975, edited by R. Amavis and J. Smeets.
  2. 2
    Published 1994
    Book
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    Biological monitoring of aquatic systems /

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