Usage History of 'unspheres'

The following chart shows how frequently 'unspheres' appeared in printed materials over time. For example, the word 'unspheres' occurred 3 times in books in 1808 and 14 times in 2008. From 1808 to 2008, the word 'unspheres' was used a total of 131 times in books scanned by Google. See Reference: Google Ngram project.

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