Usage History of 'textbooks'

The following chart shows how frequently 'textbooks' appeared in printed materials over time. For example, the word 'textbooks' occurred 2 times in books in 1600 and 189,684 times in 2008. From 1600 to 2008, the word 'textbooks' was used a total of 5,340,792 times in books scanned by Google. See Reference: Google Ngram project.

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