Usage History of 'underproof'

The following chart shows how frequently 'underproof' appeared in printed materials over time. For example, the word 'underproof' occurred 2 times in books in 1785 and 34 times in 2008. From 1785 to 2008, the word 'underproof' was used a total of 1,617 times in books scanned by Google. See Reference: Google Ngram project.

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