Usage History of 'copestone'

The following chart shows how frequently 'copestone' appeared in printed materials over time. For example, the word 'copestone' occurred 2 times in books in 1678 and 391 times in 2008. From 1678 to 2008, the word 'copestone' was used a total of 7,099 times in books scanned by Google. See Reference: Google Ngram project.

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