Usage History of 'thunderheads'

The following chart shows how frequently 'thunderheads' appeared in printed materials over time. For example, the word 'thunderheads' occurred 6 times in books in 1817 and 2,206 times in 2008. From 1817 to 2008, the word 'thunderheads' was used a total of 58,962 times in books scanned by Google. See Reference: Google Ngram project.

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