Usage History of 'subthemes'

The following chart shows how frequently 'subthemes' appeared in printed materials over time. For example, the word 'subthemes' occurred 2 times in books in 1899 and 1,322 times in 2008. From 1899 to 2008, the word 'subthemes' was used a total of 26,100 times in books scanned by Google. See Reference: Google Ngram project.

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