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Evaluation of Agricultural Best-Management Practices in the Conestoga River Headwaters, Pennsylvania: Hydrology of a Small Carbonate-Rock Site Near Ephrata, Pennsylvania, Prior to Implementation of Nutrient Management. Water Quality Study of the Conestoga River Headwaters, Pennsylvania (Revised). Water resources investigations./ Koerkle-E.H.; Hall-D.W.; Risser-D.W.; Lietman-P.L.; Chichester-D.C.
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