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Freshwater animals --- Freshwater fishes --- Freshwater invertebrates
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Freshwater animals --- Freshwater fishes --- Freshwater invertebrates
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Freshwater biology --- Freshwater ecology --- Fresh water --- Fresh water. --- Freshwater biology. --- Freshwater ecology.
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ALG Algae --- freshwater algae --- USA --- keys --- drawings
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Dams --- Freshwater invertebrates --- Acid deposition --- Environmental aspects
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Dams --- Freshwater invertebrates --- Acid deposition --- Environmental aspects
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Aquatic plants --- Freshwater --- freshwater ecology --- injurious factors --- Pollution --- Flow rate --- Plant response --- population structure --- population dynamics
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Eutrophication --- Estuarine eutrophication --- Nutrient pollution of water --- Freshwater ecology
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EUC Central Europe --- Europe --- Pteridophyta --- Algae --- freshwater --- flora
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