Usage History of 'capstone'

The following chart shows how frequently 'capstone' appeared in printed materials over time. For example, the word 'capstone' occurred 2 times in books in 1631 and 16,146 times in 2008. From 1631 to 2008, the word 'capstone' was used a total of 289,221 times in books scanned by Google. See Reference: Google Ngram project.

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