Usage History of 'proofer'

The following chart shows how frequently 'proofer' appeared in printed materials over time. For example, the word 'proofer' occurred 2 times in books in 1844 and 328 times in 2008. From 1844 to 2008, the word 'proofer' was used a total of 8,757 times in books scanned by Google. See Reference: Google Ngram project.

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