Usage History of 'reef'

The following chart shows how frequently 'reef' appeared in printed materials over time. For example, the word 'reef' occurred 2 times in books in 1507 and 180,831 times in 2008. From 1507 to 2008, the word 'reef' was used a total of 4,974,604 times in books scanned by Google. See Reference: Google Ngram project.

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