http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Potentiometric surface of the Patuxent Aquifer in southern Maryland, September 2007
by Stephen E. Curtin, David C. Andreasen, and Andrew W. Staley ; prepared in cooperation with the Maryland Geological Survey (MGS) and the Power Plant Assessment Program, Maryland Department of Natural Resources.
Relief shown by contours and spot heights.
Title from title screen (viewed on July 14, 2009).
Mode of access: Internet from the USGS web site. Address as of 7/14/09: http://pubs.usgs.gov/of/2009/1088/pdf/OFR2009-1088.pdf ; current access is available via PURL.
U.S. Geological Survey open-file report ; 2009-1088