http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Cost-effectiveness of the stream-gaging program in Puerto Rico and the U.S. Virgin Islands
1 online resource (iv, 32 pages) : illustrations, maps.
Includes bibliographical references (page 32).
Water-resources investigations report ; 90-4088