Usage History of 'amphibian'

The following chart shows how frequently 'amphibian' appeared in printed materials over time. For example, the word 'amphibian' occurred 2 times in books in 1713 and 17,725 times in 2008. From 1713 to 2008, the word 'amphibian' was used a total of 668,113 times in books scanned by Google. See Reference: Google Ngram project.

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