Allen L. Zack

• A well system to recover usable water from a freshwater-saltwater aquifer in Puerto Rico
• Geochemistry of fluoride in the Black Creek aquifer system of Horry and Georgetown counties, South Carolina--and its physiological implications
• Ground-water pumpage and related effects, southwestern Louisiana, 1970
• Puerto Rico ground-water quality
• The geochemical evolution of aqueous sodium in the Black Creek aquifer, Horry and Georgetown counties, South Carolina
• The occurrence, availability, and chemical quality of ground water, Grand Strand area and surrounding parts of Horry and Georgetown Counties, South Carolina
• U.S. Virgin Islands ground-water quality