1
Published 1979.
Subjects: '; ...United States. Environmental Protection Agency. Quality criteria for water....

Report Number(s): APA 3089

Link to introductory pages (copyrighted item).
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2
Published [1980]
Subjects: '; ...Air quality management United States....

Report Number(s): EPA-450/4-80-012 APA 2116

Link to full text
3
by Bowers, J. F.
Published 1980.
Subjects: '; ...Air quality management United States Computer programs....

Report Number(s): EPA-450/4-79-030 APA 2111

Link to full text