Usage History of 'pyrethrins'

The following chart shows how frequently 'pyrethrins' appeared in printed materials over time. For example, the word 'pyrethrins' occurred 2 times in books in 1900 and 1,542 times in 2008. From 1900 to 2008, the word 'pyrethrins' was used a total of 78,235 times in books scanned by Google. See Reference: Google Ngram project.

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