Usage History of 'valleys'

The following chart shows how frequently 'valleys' appeared in printed materials over time. For example, the word 'valleys' occurred 4 times in books in 1515 and 314,313 times in 2008. From 1515 to 2008, the word 'valleys' was used a total of 9,279,607 times in books scanned by Google. See Reference: Google Ngram project.

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