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Biological criteria research and regulation : December 12-13, 1990, Hyatt Regency Crystal City, Arlington, Virginia
- "PB 92 231505"
- "EPA 440 5 91 005"
- "Conference papers and proceedings"@en
- "Biological criteria research and regulation ; proceedings of a symposium ; December 12 - 13, 1990, Hyatt Regency Crystal City, Arlington, Virginia"
- "Biological criteria research and regulation : December 12-13, 1990, Hyatt Regency Crystal City, Arlington, Virginia"@en