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density(3)
population(3)
urban areas(3)
rural areas(2)
x-ray(2)
absorption(1)
aquifers(1)
forests(1)
geochemistry(1)
heat(1)
humidity(1)
ions(1)
islands(1)
leads(1)
minerals(1)
mortality(1)
oscillations(1)
oxygen(1)
pesticides(1)
ph(1)
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