Usage History of 'subtheme'

The following chart shows how frequently 'subtheme' appeared in printed materials over time. For example, the word 'subtheme' occurred 4 times in books in 1833 and 935 times in 2008. From 1833 to 2008, the word 'subtheme' was used a total of 24,640 times in books scanned by Google. See Reference: Google Ngram project.

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