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Water quality update, vol. 8 no. 1, January 1999
(Oklahoma State University, 1999-01)
Water quality update, vol. 8 no. 2, February-March 1999
(Oklahoma State University, 1999-02)
Water quality update, vol. 8 no. 4, September 1999
(Oklahoma State University, 1999-09)
Water quality update, vol. 8 no. 3, July 1999
(Oklahoma State University, 1999-07)