character: John Snow
topic: Historical Approaches to Water Quality
grade: 12
subject: Chemistry
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character: Louis Pasteur
topic: Microbiology and Water Quality
grade: 12
subject: Chemistry
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character: Ignaz Semmelweis
topic: Health Practices and Public Hygiene
grade: 12
subject: Chemistry
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character: Rachel Carson
topic: Environmental Impact of Water Pollution
grade: 12
subject: Chemistry
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