character: Rachel Carson
topic: Silent Spring and the Awareness of DDT's Impact
grade: 9
subject: Biology
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character: Ellen Silbergeld
topic: Consequences of DDT in Ecosystems
grade: 9
subject: Biology
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character: William C. McNulty
topic: Historical Use of DDT in Agriculture and Public Health
grade: 9
subject: Biology
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character: EPA (Environmental Protection Agency)
topic: Regulation and Banning of DDT in the United States
grade: 9
subject: Biology
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