Usage History of 'libretto'

The following chart shows how frequently 'libretto' appeared in printed materials over time. For example, the word 'libretto' occurred 4 times in books in 1671 and 30,485 times in 2008. From 1671 to 2008, the word 'libretto' was used a total of 982,030 times in books scanned by Google. See Reference: Google Ngram project.

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