Description
Item Description:Title from title screen (viewed Aug. 19, 2008).
"National Water-Quality Assessment Program."
Electronic resource.
Physical Description:vii, 85 pages : digital, PDF file.
Format:Mode of access: Internet from the USGS web site. Address as of 8/19/08: http://ct.water.usgs.gov/pubs/LISbook.pdf ; current access available via PURL.