Usage History of 'petrogeneses'

The following chart shows how frequently 'petrogeneses' appeared in printed materials over time. For example, the word 'petrogeneses' occurred 6 times in books in 1959 and 4 times in 2007. From 1959 to 2007, the word 'petrogeneses' was used a total of 172 times in books scanned by Google. See Reference: Google Ngram project.

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