Usage History of 'whistles'

The following chart shows how frequently 'whistles' appeared in printed materials over time. For example, the word 'whistles' occurred 4 times in books in 1636 and 51,567 times in 2008. From 1636 to 2008, the word 'whistles' was used a total of 1,073,015 times in books scanned by Google. See Reference: Google Ngram project.

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