http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Pesticides and nitrates in surficial sand and gravel aquifers as related to modeled contamination susceptibility in part of the Upper Mississippi River Basin
National Water-Quality Assessment Program (U.S.)
1 sheet (4 unnumbered pages) : color illustrations, color maps ; 28 cm.
"National Water-Quality Assessment Program"
Includes bibliographical references (page [43]).
Fact sheet (Geological Survey (U.S.)) ; FS-98-107