Usage History of 'holographs'

The following chart shows how frequently 'holographs' appeared in printed materials over time. For example, the word 'holographs' occurred 4 times in books in 1683 and 647 times in 2008. From 1683 to 2008, the word 'holographs' was used a total of 20,306 times in books scanned by Google. See Reference: Google Ngram project.

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