http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Pacific Northwest stream quality assessment
1 online resource (2 unnumbered pages) : color illustrations.
Title from title screen (viewed May 6, 2015).
"National Water-Quality Assessment Program."
Includes bibliographical references (page [2]).
National Water-Quality Assessment Program (U.S.)
Fact sheet (Geological Survey (U.S.)) ; 2015-3020