Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania : characterization of surface-runoff and ground-water quantity and quality in a small carbonate basin near Churchtown, Pennsylvania, prior to terracing and implementation of nutrient management : water-quality study of the Conestoga River headwaters, Pennsylvania
1996 ◽
1997 ◽
1992 ◽
1997 ◽
2017 ◽
2011 ◽
Vol 183
(1-4)
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pp. 351-379
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1993 ◽