Titlebook: Biological Indicators of Freshwater Pollution and Environmental Management; J. M. Hellawell Book 1986 Elsevier Science Publishers Ltd 1986

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Histomorphologie (Typing und Grading)d in subsequent chapters. The emphasis here, then, will be placed on those matters which are important for a better understanding of the ways in which the consequences of particular activities, for example the use of pesticides or the discharge of certain effluents, may extend beyond the immediate areas of spatial or temporal influence.

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Freshwater Ecosystems,d in subsequent chapters. The emphasis here, then, will be placed on those matters which are important for a better understanding of the ways in which the consequences of particular activities, for example the use of pesticides or the discharge of certain effluents, may extend beyond the immediate areas of spatial or temporal influence.

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