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Pollution
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--subdivision Environmental conditions under names of countries, cities, etc.
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--subdivision Waste disposal under types of industries, industrial processes, and facilities, e.g. Construction industry--Waste disposal; Metals--Finishing--Waste disposal
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Here are entered works on the substances which contaminate or degrade the environment. Works on the condition resulting from the action of environmental contaminants are entered under Pollution.
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--subdivision Waste disposal under types of industries, industrial processes, facilities and institutions, e.g. Construction industry--Waste disposal; Metals--Finishing--Waste disposal; Universities and colleges--Waste disposal
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Here are entered general works on pollution and works limited to urban pollution of regions, countries, states, etc. Works on urban pollution of individual cities, city regions, or metropolitan areas are entered under the heading Pollution with local subdivision.
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