Title from title screen (viewed on Sep. 29, 2005). "September 1998." "EPA 816-R-98-018."
Bibliography Note
Includes bibliographical references.
Technical Details
Mode of access: Internet from the EPA web site. Address as of 9/29/2005: http://www.epa.gov/safewater/swp/bioind.pdf; current access available via PURL.
Action Note
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