http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Preliminary estimates of residence times and apparent ages of ground water in the Chesapeake Bay watershed, and water-quality data from a survey of springs
vi, 75 pages : illustrations, maps (some color) ; 28 cm.
Includes bibliographical references (pages 52-55).
Water-resources investigations report ; 97-4225