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(465)
administrative divisions,
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(396)
mortality,
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population estimates...
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(639)
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treaty agreements/results...
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(365)
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(493)
acid deposition,
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(330)
conservation,
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preservation...
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(336)
deforestation,
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(35)
household income,
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(8)
archaeological areas,
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rural areas,
urban areas...
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(12)
environmental sustainability,
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(486)
buildings,
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