Usage History of 'refs'

The following chart shows how frequently 'refs' appeared in printed materials over time. For example, the word 'refs' occurred 2 times in books in 1659 and 17,489 times in 2008. From 1659 to 2008, the word 'refs' was used a total of 1,084,556 times in books scanned by Google. See Reference: Google Ngram project.

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