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УДК
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удк
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Голубев Г. Н. Геоэкология. Учебник для студентов ВУЗов. М., Изд-во ГЕОС, 1999, 338с., ISBN 5-89118-059-6, УДК 574.9, ББК 26.82.pdf
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УДК 376.doc
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