http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 online resource (2 unnumbered pages) : color illustrations, color map.
Title from title screen (viewed on Feb. 7, 2013).
"A collaboration between the U.S. Geological Survey and the U.S. Environmental Protection Agency."
Includes bibliographical references (page 2).
Fact sheet (Geological Survey (U.S.)) ; 2012-3124