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rural areas(18)
urban areas(15)
population(10)
public health(4)
surface water(4)
air quality(2)
household income(2)
morbidity(2)
ammonia(1)
coastal areas(1)
conservation(1)
coral reefs(1)
density(1)
fisheries(1)
forests(1)
lakes(1)
lead(1)
mortality(1)
ph(1)
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