Basic Ground-Water Hydrology
R.C. Heath 1983 U.S. Geological Survey Water Supply Paper 2220, 84 p.
Well-written primer on the fundamentals of regional ground-water flow, Darcy's Law, radial flow to wells, aquifer testing, stream/aquifer interaction, and contaminant transport. Written at a level for general education. It contains many helpful graphs, tables, and diagrams.