Groundwater

Water in the unsaturated zone edited by P. E. Rijtema and H. Wassink 1968 Water in the unsaturated zone; proceedings of the Wageningen Symposium UNESCO 1968 Water management in reservoirs Votruba, Ladislav 1989 Water quality in a stressed environment Pettyjohn, Wayne A. 1972 Water sampling and chemical analysis for groundwater investigations [edited by the German Association for Water Resources and Land Improvement] 1985 Water well technology Campbell, Michael D. 1973