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https://digital.sciencehistory.org/works/1831ck18wandhttps://clickamericana.com/topics/health-medicine/ddt-dangerous-old-insecticide-used-to-be-everywhere
https://digital.sciencehistory.org/works/1831ck18w
and
https://clickamericana.com/topics/health-medicine/ddt-dangerous-old-insecticide-used-to-be-everywhere