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Evaluation of Agricultural Best-Management Practices in the Conestoga River Headwaters, Pennsylvania: Effects of Pipe-Outlet Terracing on Quantity and Quality of Surface Runoff and Ground Water in a Small Carbonate-Rock Basin Near Churchtown, Pennsylvania, 1983-89. Water Quality Study of the Conestoga River Headwaters, Pennsylvania. Water resources investigations rept./ Lietman-P.L.; Gustafson-Minnich-L.C.; Hall-D.W.
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