"Eau souterraine." . . . . "Puits." . . "Geologie. Aardwetenschappen." . . "Groundwater & wells" . . "Groundwater and wells" . . . . "Groundwater and wells : [a comprehensive guide for the design, installation, and maintenance of a water well]" . . . . . . . . . . . . "Groundwater and wells" . . "Watervoorziening. Waterzuivering. Waterverontreiniging." . .