Usage History of 'rockier'

The following chart shows how frequently 'rockier' appeared in printed materials over time. For example, the word 'rockier' occurred 2 times in books in 1652 and 1,394 times in 2008. From 1652 to 2008, the word 'rockier' was used a total of 26,856 times in books scanned by Google. See Reference: Google Ngram project.

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