Usage History of 'coal'

The following chart shows how frequently 'coal' appeared in printed materials over time. For example, the word 'coal' occurred 8 times in books in 1515 and 1,027,706 times in 2008. From 1515 to 2008, the word 'coal' was used a total of 38,176,979 times in books scanned by Google. See Reference: Google Ngram project.

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