http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Ground-water resources of the Piney Point and Cheswold aquifers in central Delaware as determined by a flow model
by P. Patrick Leahy ; prepared by the United States Geological Survey in cooperation with the Delaware Geological Survey.
Bulletin (Delaware Geological Survey) ; no. 16