Usage History of 'superstratum'

The following chart shows how frequently 'superstratum' appeared in printed materials over time. For example, the word 'superstratum' occurred 2 times in books in 1700 and 408 times in 2008. From 1700 to 2008, the word 'superstratum' was used a total of 14,798 times in books scanned by Google. See Reference: Google Ngram project.

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