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surface water(49)
lakes(26)
carbon(9)
salinity(8)
estuaries(7)
organic carbon(7)
water quality(6)
conservation(4)
nitrogen(4)
oxygen(4)
population(4)
ammonia(3)
contaminants(3)
degradation(3)
drought(3)
lead(3)
organic matter(3)
phosphorus(3)
precipitation(3)
sediments(3)
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