Usage History of 'tetrapods'

The following chart shows how frequently 'tetrapods' appeared in printed materials over time. For example, the word 'tetrapods' occurred 6 times in books in 1832 and 5,225 times in 2008. From 1832 to 2008, the word 'tetrapods' was used a total of 128,217 times in books scanned by Google. See Reference: Google Ngram project.

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