Usage History of 'ruga'

The following chart shows how frequently 'ruga' appeared in printed materials over time. For example, the word 'ruga' occurred 1 time in books in 1507 and 1,402 times in 2008. From 1507 to 2008, the word 'ruga' was used a total of 43,342 times in books scanned by Google. See Reference: Google Ngram project.

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