http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
distribution of submersed aquatic vegetation and water lettuce in the fresh and oligohaline tidal Potomac River, 2007
1 online resource (vi, 33 pages) : color maps.
by Sarah Hunter Campbell, Nancy B. Rybicki, and Edward R. Schenk.
Title from title screen (viewed on July 16, 2015).
Includes bibliographical references (pages 6-7).
U.S. Geological Survey open-file report ; 2014-1259