Usage History of 'untreated'

The following chart shows how frequently 'untreated' appeared in printed materials over time. For example, the word 'untreated' occurred 2 times in books in 1671 and 81,319 times in 2008. From 1671 to 2008, the word 'untreated' was used a total of 2,600,593 times in books scanned by Google. See Reference: Google Ngram project.

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