http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Agricultural pesticides found in ground water of the Quincy and Pasco basins
National Water-Quality Assessment Program (U.S.)
"National Water-Quality Assessment Program"--P. [4].
Fact sheet (Geological Survey (U.S.)) ; FS-95-240