Santiago, Marilyn. <br/><br/>
Hydrologic unit boundaries for the U.S. Virgin Islands  [electronic resource] 
by Marilyn Santiago, Luis Santiago-Rivera and Orlando Ramos-Ginés ; U.S. Department of the Interior, U.S. Geological Survey. 
, Scale 1:24,000  Universal transverse Mercator proj. 
, Electronic map data. 
 - [Reston, Va.?]  The Survey  [2000?] 
 - 1 computer optical disc  4 3/4 in. 
 - Open-File Report  99-223 .
 - U.S. Geological Survey open-file report  99-223. .
<br/><br/> Coordinates estimated from cover illustration.  Title from CD-ROM cover. 
<br/><br/><br/>System requirements: ARC/INFO (ver. 7)-compatible geographic information system. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrology--Virgin Islands of the United States--Maps.