1. State of disequilibrium between 238U, 234U, 226Ra and 222Rn in groundwater from bedrock;Asikainen;Geochim. Cosmochim. Acta,1981
2. Geology of the Ciales Quadrangle, Puerto Rico;Berryhill;U.S. Geol. Surv. Bull.,1965
3. Geologic map of the Barceloneta quadrangle, Puerto Rico;Briggs,1965
4. An application of natural radon to problems in ocean circulation;Broecker,1965
5. Tracers in the Sea;Broecker,1982