http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
National Water-Quality Assessment Program (U.S.)
1 online resource (2 unnumbered pages) : illustrations, map (chiefly color).
Includes bibliographical references (page [2]).
Fact sheet (Geological Survey (U.S.)) ; 2017-3014