1. Costs of wells and pumps;Ackermann;Ground Water,1869
2. Well design criteria;Ahrens;Water Well J.,1957
3. Finding ways to save pumping costs;Anonymous;Johnson Driller's J.,1969
4. The free surface around and interference between gravity wells;Babbitt;Univ. Illinois Bull. Eng. Exp. St.,1948
5. Developments in the application of geophysics to ground-water problems;Bays;Illinois State Geol. Survey Circ.,1944