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210   $aNew York$cJohn Wiley & sons inc.$d1952
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200 10$aPotentiometric surface of the principal aquifer and hydrologic conditions in the Ponce-Juana Diaz area, Puerto Rico, April-May, 1987 /$fby Fe?lix Rodri?guez del Ri?o and Vicente Quinones-Aponte
210  1$aSan Juan, Puerto Rico :$cU.S. Department of the Interior, U.S. Geological Survey,$d1990.
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300   $aRelief shown by contours and spot heights.
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