Usage History of 'workbook'

The following chart shows how frequently 'workbook' appeared in printed materials over time. For example, the word 'workbook' occurred 2 times in books in 1766 and 75,689 times in 2008. From 1766 to 2008, the word 'workbook' was used a total of 1,770,060 times in books scanned by Google. See Reference: Google Ngram project.

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