Usage History of 'petrologies'

The following chart shows how frequently 'petrologies' appeared in printed materials over time. For example, the word 'petrologies' occurred 4 times in books in 1876 and 2 times in 2008. From 1876 to 2008, the word 'petrologies' was used a total of 309 times in books scanned by Google. See Reference: Google Ngram project.

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