Usage History of 'subtopic'

The following chart shows how frequently 'subtopic' appeared in printed materials over time. For example, the word 'subtopic' occurred 2 times in books in 1879 and 2,886 times in 2008. From 1879 to 2008, the word 'subtopic' was used a total of 80,759 times in books scanned by Google. See Reference: Google Ngram project.

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