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I 19.76:93-50 : Geological Survey (U.S.)
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I 19.76:93-58 : Hydrologic Instrumentation Facility (U.S.).
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I 19.76:93-65 : Geological Survey (U.S.)
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I 19.76:93-78 : Treece, M. W.
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I 19.76:93-96 : U.S. Geological Survey National Computer Technology Meeting.
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I 19.76:93-97 : Geological Survey (U.S.)
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