character: Rachel Carson
topic: Influence of Silent Spring on DDT Regulation
grade: 9
subject: Geography
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character: The Environmental Protection Agency (EPA)
topic: Role in DDT Use Regulation
grade: 9
subject: Geography
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character: Farmers in the Mid-20th Century
topic: DDT's Impact on Agriculture
grade: 9
subject: Geography
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character: Global Health Organizations
topic: DDT and Malaria Control Efforts
grade: 9
subject: Geography
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