Usage History of 'checkpoints'

The following chart shows how frequently 'checkpoints' appeared in printed materials over time. For example, the word 'checkpoints' occurred 2 times in books in 1777 and 30,997 times in 2008. From 1777 to 2008, the word 'checkpoints' was used a total of 410,811 times in books scanned by Google. See Reference: Google Ngram project.

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