"Groundwater quality." . . "Data analysis." . . . . . "Ground-water quality assessment of the Central Oklahoma aquifer, Oklahoma : analysis of available water quality data through 1987" . "Ground-water-quality Assessment of the Central Oklahoma Aquifer, Oklahoma - Analysis of Available Water-quality Data through 1987" . . . . . . . . "Ground-water quality assessment of the central Oklahoma aquifer, Oklahoma analysis of available water-quality data through 1987"@en . . . . "Ground-water-quality assessment of the central Oklahoma Aquifer, Oklahoma : analysis of available water-quality data through 1987" . . . "Ground-water quality assessment of the central Oklahoma aquifer, Oklahoma : analysis of available water-quality data through 1987"@en . . . . . . . . "Ground-water-quality assessment of the central Oklahoma aquifer, Oklahoma - Analysis of available water-quality data through 1987 : Chapter B" . . . "Ground-water-quality assessment of the Central Oklahoma aquifer, Oklahoma - analysis of available data through 1987"@en . . "Ground-water quality assessment of the Central Oklahoma aquifer, Oklahoma : analysis of available water-quality data through 1987" . . . . . . . "Analysis of available water-quality data through 1987"@en . . . . . . "USA." . . "Oklahoma." . . "Wassergüte." . . "US Geological Survey." . . "Grundwasserleiter." . . . .