1. Back , W. Origin of hydrochemical facies of ground water in the Atlantic coastal plain Intern. Geol. Congr., 21st, Copenhagen, 1960, Rept. Session, Norden, part 1 87 95 Copenhagen 1960
2. The theory of groundwater motion;Hubbert;J. Geol.,1940
3. King , F. H. Observations and experiments on the fluctuations in the level and rate of movement of ground-water on the Wisconsin Agricultural Experiment Station Farm, U. S. Dept. Agr. Weather Bureau, Bull. no 5 1892
4. Meinzer , O. E. Outline of ground-water hydrology with definitions, U. S. Geol. Surv. Water Supply Paper 494 1923