scholarly journals Water-quality data for two surface coal mines reclaimed with alkaline waste or urban sewage sludge, Clarion County, Pennsylvania, May 1983 through November 1989

1993 ◽  
Author(s):  
D.L. Dugas ◽  
C.A. Cravotta ◽  
D.A. Saad
2000 ◽  
Author(s):  
Kathryn M. Conko ◽  
Margaret M. Kennedy ◽  
Karen C. Rice

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