Usage History of 'sierras'

The following chart shows how frequently 'sierras' appeared in printed materials over time. For example, the word 'sierras' occurred 2 times in books in 1524 and 16,334 times in 2008. From 1524 to 2008, the word 'sierras' was used a total of 426,805 times in books scanned by Google. See Reference: Google Ngram project.

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