State government records are the most suitable source for Nita's research on DDT's historical use and its impact on the environment.
State government records would be the most appropriate source for Nita to use in her research on the historical use of DDT in her home state and its effect on animals and plants. State government records are likely to contain official data, regulations, and information related to the use of pesticides, including DDT, which can provide accurate historical context and data for Nita's research.
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