Usage History of 'phreatic'

The following chart shows how frequently 'phreatic' appeared in printed materials over time. For example, the word 'phreatic' occurred 2 times in books in 1680 and 2,611 times in 2008. From 1680 to 2008, the word 'phreatic' was used a total of 87,741 times in books scanned by Google. See Reference: Google Ngram project.

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