Usage History of 'permian'

The following chart shows how frequently 'permian' appeared in printed materials over time. For example, the word 'permian' occurred 2 times in books in 1718 and 27,228 times in 2008. From 1718 to 2008, the word 'permian' was used a total of 1,281,666 times in books scanned by Google. See Reference: Google Ngram project.

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