Usage History of 'referrals'

The following chart shows how frequently 'referrals' appeared in printed materials over time. For example, the word 'referrals' occurred 4 times in books in 1838 and 67,838 times in 2008. From 1838 to 2008, the word 'referrals' was used a total of 1,516,254 times in books scanned by Google. See Reference: Google Ngram project.

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