[Washington, D.C.] : United States Environmental Protection Agency, Office of Water, [2003]
Physical Details
1 electronic text : HTML file
data file
OCLC
ocm64230716
Title from title screen (viewed on Feb. 22, 2006).
"March 2003."
"EPA 821-F-03-007."
Mode of access: Internet from the EPA web site. Address as of 2/22/2006: http://www.epa.gov/waterscience/316b/ph1dirfwithfs.htm; current access available via PURL.