Usage History of 'blackboard'

The following chart shows how frequently 'blackboard' appeared in printed materials over time. For example, the word 'blackboard' occurred 2 times in books in 1688 and 61,505 times in 2008. From 1688 to 2008, the word 'blackboard' was used a total of 1,592,985 times in books scanned by Google. See Reference: Google Ngram project.

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