Usage History of 'argillite'

The following chart shows how frequently 'argillite' appeared in printed materials over time. For example, the word 'argillite' occurred 4 times in books in 1760 and 1,921 times in 2008. From 1760 to 2008, the word 'argillite' was used a total of 122,147 times in books scanned by Google. See Reference: Google Ngram project.

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