Usage History of 'promptbooks'

The following chart shows how frequently 'promptbooks' appeared in printed materials over time. For example, the word 'promptbooks' occurred 4 times in books in 1839 and 298 times in 2008. From 1839 to 2008, the word 'promptbooks' was used a total of 10,682 times in books scanned by Google. See Reference: Google Ngram project.

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