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character: Dr. Carl Sagan
topic: pH Measurement Techniques in Environmental Chemistry
grade: 12
subject: Chemistry
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character: Dr. Carl Sagan
topic: The Importance of pH in Aquatic Ecosystems
grade: 12
subject: Chemistry
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character: Dr. Carl Sagan
topic: Historical Perspectives on Environmental Chemistry
grade: 12
subject: Chemistry
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character: Dr. Carl Sagan
topic: Sustainable Practices in Environmental Chemistry
grade: 12
subject: Chemistry
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