Usage History of 'petrography'

The following chart shows how frequently 'petrography' appeared in printed materials over time. For example, the word 'petrography' occurred 8 times in books in 1797 and 3,415 times in 2008. From 1797 to 2008, the word 'petrography' was used a total of 163,164 times in books scanned by Google. See Reference: Google Ngram project.

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