Usage History of 'tortoises'

The following chart shows how frequently 'tortoises' appeared in printed materials over time. For example, the word 'tortoises' occurred 2 times in books in 1524 and 17,850 times in 2008. From 1524 to 2008, the word 'tortoises' was used a total of 444,328 times in books scanned by Google. See Reference: Google Ngram project.

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