Ground-water levels and chloride concentrations in alluvial aquifers on the south coast of Puerto Rico, February 1980

Atlas of ground-water resources in Puerto Rico and the U.S. Virgin Islands

“…In the 1990 Census (U.S. Department of Commerce, 1991), the population within these municipios was 65,318. This represents an increase of 17 percent from 1980. In 1980 percent of the population in the municipios of Dorado and Vega Alta resided within the urban limits of both municipios.…”

Effects of changing irrigation practices on the ground-water hydrology of the Santa Isabel-Juana Díaz area, south central Puerto Rico

“…Studies of ground-water levels and chloride concentrations in the study area include those by H. Colon-Ramos (U.S. Geological Survey, unpublished data, 1972), Colon-Ramos and Colon-Dieppa (1981), Colon-Dieppa and Gonzalez (1981), J.R. Diaz (U.S. Geological Survey, unpublished data, 1974), J.R. Diaz (1974Diaz ( , 1977aDiaz ( , 1977bDiaz ( , 1979aDiaz ( , and 1979b, J.E. Heisel (U.S. Geological Survey, unpublished data, 1973), Heisel and Gonzalez (1976), D.G.…”