Usage History of 'permethrins'

The following chart shows how frequently 'permethrins' appeared in printed materials over time. For example, the word 'permethrins' occurred 2 times in books in 1981 and 46 times in 2008. From 1981 to 2008, the word 'permethrins' was used a total of 528 times in books scanned by Google. See Reference: Google Ngram project.

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