Usage History of 'pozzolanas'

The following chart shows how frequently 'pozzolanas' appeared in printed materials over time. For example, the word 'pozzolanas' occurred 8 times in books in 1790 and 102 times in 2008. From 1790 to 2008, the word 'pozzolanas' was used a total of 9,230 times in books scanned by Google. See Reference: Google Ngram project.

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