Usage History of 'boulders'

The following chart shows how frequently 'boulders' appeared in printed materials over time. For example, the word 'boulders' occurred 2 times in books in 1624 and 101,180 times in 2008. From 1624 to 2008, the word 'boulders' was used a total of 2,440,110 times in books scanned by Google. See Reference: Google Ngram project.

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