http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Groundwater-quality and select quality-control data from the National Water-Quality Assessment Project, January 2017 through December 2019
National Water-Quality Assessment Program (U.S.)
1 online resource (x, 97 pages) : color illustrations, color maps.
by James A. Kingsbury [and eight others].
"National Water-Quality Assessment Project."
Data series (Geological Survey (U.S.)) ; 1136