REFINE     Who What Where When     REMOVE DDT (Insecticide); Malaria-- … WHAT DDT (Insecticide); Malari … (1) WHERE Washington, D.C. (1) WHO United States. Government … (1) WHEN 1940 (1)

REFINE  Browse All : DDT (Insecticide); Malaria--Prevention; Mosquitoes--Control 1-1 of 1 How DDT spray keeps mal... 1940   Title How DDT spray keeps malaria away Date Published 1940 1-1 of 1

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