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Biotic communities --- Biodiversity --- Numbers of species --- Algae --- Aquatic invertebrates --- Fishes --- Water quality
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Nutrient pollution of water --- Water --- Measurement --- Methodology. --- Pollution
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Water quality biological assessment --- Water-supply --- Stream ecology --- Aquatic ecology --- Water --- Sampling --- National Water-Quality Assessment Program (U.S.)
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Trace elements --- Invertebrate communities --- Contaminated sediments --- Environmental aspects --- Toxicology
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Water quality biological assessment --- Water-supply --- Stream ecology --- Aquatic ecology --- Water --- Sampling --- National Water-Quality Assessment Program (U.S.)
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Trace elements --- Invertebrate communities --- Contaminated sediments --- Environmental aspects --- Toxicology
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Biotic communities --- Biodiversity --- Numbers of species --- Algae --- Aquatic invertebrates --- Fishes --- Water quality
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Nutrient pollution of water --- Nutrient pollution of water --- Water --- Water --- Measurement --- Methodology. --- Pollution --- Pollution --- Measurement --- Methodology.
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Artificial satellites in geographical research. --- Land use surveys --- Land cover --- Land use mapping --- Water quality --- Land use surveys. --- Water quality. --- Maps. --- Lake Michigan Watershed. --- United States --- Wisconsin
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Water quality --- Fish communities --- Fish communities. --- Water quality. --- Ozark Mountains. --- United States
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