Usage History of 'petroglyph'

The following chart shows how frequently 'petroglyph' appeared in printed materials over time. For example, the word 'petroglyph' occurred 2 times in books in 1854 and 3,785 times in 2008. From 1854 to 2008, the word 'petroglyph' was used a total of 93,384 times in books scanned by Google. See Reference: Google Ngram project.

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