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Submitted on: 08 January 1999.
Revised on: 07 February 1999.
Accepted on: 09 March 1999.
___________________JOURNAL OF ENVIRONMENTAL QUALITY
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Submitted on: 04 November 1998.
Revised on: 09 February 1999.
Accepted on: 30 March 1999.
___________________JOURNAL OF ENVIRONMENTAL QUALITY
Submitted on: 25 November 2013.
Revised on: 16 January 2014.
Accepted on: 10 February 2014.
___________________JOURNAL OF ENVIRONMENTAL QUALITY
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