Usage History of 'roundballs'

The following chart shows how frequently 'roundballs' appeared in printed materials over time. For example, the word 'roundballs' occurred 2 times in books in 1890 and 1 times in 2007. From 1890 to 2007, the word 'roundballs' was used a total of 153 times in books scanned by Google. See Reference: Google Ngram project.

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