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1981by : National Park Service“...National Park Service Water Resources Division...”
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1982by : National Park Service“...National Park Service Water Resources Division...”
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1983by : National Park Service“...National Park Service Water Resources Division...”
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1984by : National Park Service“...National Park Service Water Resources Division...”
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1985by : National Park Service“...National Park Service Water Resources Division...”
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1986by : National Park Service“...National Park Service Water Resources Division...”
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1987by : National Park Service“...National Park Service Water Resources Division...”
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1988by : National Park Service“...National Park Service Water Resources Division...”
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1989by : National Park Service“...National Park Service Water Resources Division...”
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1990by : National Park Service“...National Park Service Water Resources Division...”
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1991by : National Park Service“...National Park Service Water Resources Division...”
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1992by : National Park Service“...National Park Service Water Resources Division...”
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1993by : National Park Service“...National Park Service Water Resources Division...”
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1994by : National Park Service“...National Park Service Water Resources Division...”
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1995by : National Park Service“...National Park Service Water Resources Division...”
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1996by : National Park Service“...National Park Service Water Resources Division...”
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1997by : National Park Service“...National Park Service Water Resources Division...”
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1998by : National Park Service“...National Park Service Water Resources Division...”
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1999by : National Park Service“...National Park Service Water Resources Division...”
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2000by : National Park Service“...National Park Service Water Resources Division...”
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