character: John Wesley Powell
topic: Water Management and Geological Studies
grade: 9
subject: History
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character: Henry David Thoreau
topic: Environmental Philosophy and Natural Resource Management
grade: 9
subject: History
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character: Rachel Carson
topic: Impact of Geological Studies on Environmental Policies
grade: 9
subject: History
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character: Elinor Ostrom
topic: Collective Management of Water Resources
grade: 9
subject: History
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