Usage History of 'duros'

The following chart shows how frequently 'duros' appeared in printed materials over time. For example, the word 'duros' occurred 2 times in books in 1700 and 1,153 times in 2008. From 1700 to 2008, the word 'duros' was used a total of 31,613 times in books scanned by Google. See Reference: Google Ngram project.

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