Usage History of 'reference'

The following chart shows how frequently 'reference' appeared in printed materials over time. For example, the word 'reference' occurred 6 times in books in 1505 and 3,112,852 times in 2008. From 1505 to 2008, the word 'reference' was used a total of 88,792,456 times in books scanned by Google. See Reference: Google Ngram project.

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