1. Maryland Dept. Geology, Mines and Water Resources Bul.;Bennett,1952
2. Ground water;Ferris,1949
3. Estimated use of ground water in the United States, 1945;Guyton;V. S. Geol. Survey open file rep,1949
4. Correlation of ground-water levels and precipitation on Long Island, N. Y., pt. 1, Theory;Jacob;Trans. Amer. Geophys. Union,1943
5. Flow of ground water;Jacob,1950