character: John Wesley Powell
topic: Principles of Sustainable Water Usage
grade: 9
subject: Geography
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character: John Wesley Powell
topic: Geological Surveys of the Colorado River
grade: 9
subject: Geography
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character: John Wesley Powell
topic: Conservation of Natural Resources
grade: 9
subject: Geography
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character: John Wesley Powell
topic: Impact of Dams on Water Ecosystems
grade: 9
subject: Geography
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