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shallow depth  search
RTaquifers
 depth
 ground water
 hydrogeology
 levels
 springs
 surficial geology
 unconfined aquifers
 water table
SNUse shallow-water environment for paleoecology and shallow-focus earthquakes for earthquakes and upper crust for geophysics and surficial aquifers for aquifers as applicable. Added to Thesaurus in 1993.