Usage History of 'shale'

The following chart shows how frequently 'shale' appeared in printed materials over time. For example, the word 'shale' occurred 2 times in books in 1600 and 60,082 times in 2008. From 1600 to 2008, the word 'shale' was used a total of 3,997,671 times in books scanned by Google. See Reference: Google Ngram project.

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