character: Henry E. Hale
topic: Historical Use of DDT in Agriculture
grade: 12
subject: Chemistry
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character: Rachel Carson
topic: Impact of DDT on the Environment
grade: 12
subject: Chemistry
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character: Environmental Protection Agency (EPA)
topic: Regulation of Pesticides and DDT
grade: 12
subject: Chemistry
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character: Farming Communities
topic: Effects of DDT Use in Agriculture
grade: 12
subject: Chemistry
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