Usage History of 'reefs'

The following chart shows how frequently 'reefs' appeared in printed materials over time. For example, the word 'reefs' occurred 2 times in books in 1524 and 98,311 times in 2008. From 1524 to 2008, the word 'reefs' was used a total of 2,549,105 times in books scanned by Google. See Reference: Google Ngram project.

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