Union Catalogue of Belgian Libraries
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Geology, hydrology and history of the Washington, D.C. area.
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Are fertilizers and pesticides in the ground water? A case study of the Delmarva Peninsula, Delaware, Maryland, and Virginia
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Water resources division in the 1980's: : a summary of activities and programs of the U.S. geological survey's water resources division 1986
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Are fertilizers and pesticides in the ground water? A case study of the Delmarva Peninsula, Delaware, Maryland, and Virginia
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Water resources division in the 1980's : a summary of activities and programs of the U.S. geological survey's water resources division 1986
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Persistence of the DDT pesticide in the Yakima river basin Washington
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Persistence of the DDT pesticide in the Yakima river basin Washington
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Persistence of the DDT pesticide in the Yakima River Basin, Washington
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Water Resources Division in the 1980's : a summary of activities and programs of the U.S. Geological Survey's Water Resources Division
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