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precipitation(2)
carbon(1)
carbon dioxide(1)
carbonate(1)
emissions(1)
floods(1)
irrigation(1)
isotopes(1)
nitrate(1)
nitrogen(1)
paleoclimate(1)
pesticides(1)
phosphate(1)
salinity(1)
soils(1)
surface water(1)
wetlands(1)
x-ray(1)