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Air --- Pollution --- United States.
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Pesticides --- Water --- Biodegradation. --- Environmental aspects. --- Pollution.
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Dredging --- Dredging spoil --- Environmental aspects --- Great Lakes (North America) --- Environmental aspects.
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Eutrophication. --- Phosphorus. --- Lake ecology.
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Sewage --- Aquatic ecology --- Freshwater fishes. --- Fishes --- Chlorine --- Purification --- Chlorination. --- Toxicology. --- Effect of water pollution on. --- Toxicology.
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Heavy metals. --- Soil pollution. --- Air --- Copper industry and trade --- Plants --- Pollution --- Waste disposal --- Environmental aspects. --- Effect of air pollution on.
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Phytoplankton --- Mathematical models. --- Ontario, Lake (N.Y. and Ont.) --- Lake Ontario.
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Feedlots --- Farm manure. --- Waste disposal.
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