http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
historical look at changing water quality in the Delaware River Basin
1 online resource (2 unnumbered pages) : color illustrations, color maps, charts.
By Jennifer C. Murphy and Megan E. Shoda.
"Integrated Water Availability Assessments Program."
Includes bibliographical references (page 2).
Delaware River Watershed (N.Y.-Del. and N.J.)
Fact sheet (Geological Survey (U.S.)) ; 2020-3007