Usage History of 'mules'

The following chart shows how frequently 'mules' appeared in printed materials over time. For example, the word 'mules' occurred 2 times in books in 1507 and 172,341 times in 2008. From 1507 to 2008, the word 'mules' was used a total of 3,780,901 times in books scanned by Google. See Reference: Google Ngram project.

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