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2. Geology of the San Juan metropolitan area, Puerto Rico
3. Shoreline features and quaternary shoreline changes, Puerto Rico
4. Floods of September 6, 1960, in eastern Puerto Rico
5. Hydrology and effects of development on the water-table aquifer in the Vega Alta quadrangle, Puerto Rico
6. Potentiometric surface of the alluvial aquifer and hydrologic conditions near Caguas, Puerto Rico, March 1988
7. Reconnaissance of the ground-water resources of Vieques Island, Puerto Rico
8. Potentiometric surface of the alluvial aquifer and hydrologic conditions near Gurabo and Juncos, Puerto Rico, March 1988
9. Low-flow characteristics at selected sites on streams in eastern Puerto Rico
10. Ground-water resources of the Caguas-Juncos Valley, Puerto Rico
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