[Washington, D.C.] : United States Environmental Protection Agency, Office of Water, [2001]
OCLC
ocm61272694
Title from title screen (viewed on Aug. 16, 2005).
"October 2001."
"EPA 816-R-01-010."
Mode of access: Internet from the EPA web site. Address as of 8/16/2005: http://www.epa.gov/safewater/pws/pn/impguide.pdf; current access available via PURL.