Usage History of 'petrels'

The following chart shows how frequently 'petrels' appeared in printed materials over time. For example, the word 'petrels' occurred 4 times in books in 1703 and 7,646 times in 2008. From 1703 to 2008, the word 'petrels' was used a total of 207,979 times in books scanned by Google. See Reference: Google Ngram project.

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