Usage History of 'digraphic'

The following chart shows how frequently 'digraphic' appeared in printed materials over time. For example, the word 'digraphic' occurred 2 times in books in 1863 and 44 times in 2008. From 1863 to 2008, the word 'digraphic' was used a total of 3,433 times in books scanned by Google. See Reference: Google Ngram project.

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