Usage History of 'petrologic'

The following chart shows how frequently 'petrologic' appeared in printed materials over time. For example, the word 'petrologic' occurred 2 times in books in 1851 and 648 times in 2008. From 1851 to 2008, the word 'petrologic' was used a total of 45,669 times in books scanned by Google. See Reference: Google Ngram project.

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