character: John Wesley Powell
topic: Impact of geological surveys on water management policies
grade: 9
subject: History
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character: Water Management Policies
topic: Influence of geological studies
grade: 9
subject: History
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character: U.S. Geological Survey
topic: Role in planning water resource management
grade: 9
subject: History
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character: Geological Discoveries
topic: Effects on irrigation and agriculture development
grade: 9
subject: History
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