TY - RPRT TI - Water Resources Data, Puerto Rico and the U.S. Virgin Islands, Water Year 1999 AU - Pedro L. Diaz AU - Zaida Aquino AU - Carlos Figueroa-Alamo AU - Ricardo J. Vachier AU - Ana V. Sanchez PY - 2000 DO - 10.3133/wdrpr991 UR - https://pubs.usgs.gov/publication/wdrPR991 ID - wdrPR991 ER -