Usage History of 'vocalizations'

The following chart shows how frequently 'vocalizations' appeared in printed materials over time. For example, the word 'vocalizations' occurred 2 times in books in 1838 and 13,873 times in 2008. From 1838 to 2008, the word 'vocalizations' was used a total of 387,144 times in books scanned by Google. See Reference: Google Ngram project.

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