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Colloquium on the Evaluation of Toxicological Data for the Protection of Public Health (1976 : Luxemburg)
ScienceDirect https://www.sciencedirect.com/science/book/9780080219981
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European Scientific Colloquium: Principles and Methods for Determining Ecological Criteria on Hydrobiocenoses (1975 : Luxemburg)
ScienceDirect https://www.sciencedirect.com/science/book/9780080212333
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