http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Factors affecting areas contributing recharge to wells in shallow aquifers
by Thomas E. Reilly and David W. Pollock.
Includes bibliographical references (pages 20-21).
U.S. Geological Survey water-supply paper ; 2412