Usage History of 'subcluster'

The following chart shows how frequently 'subcluster' appeared in printed materials over time. For example, the word 'subcluster' occurred 4 times in books in 1868 and 739 times in 2008. From 1868 to 2008, the word 'subcluster' was used a total of 14,163 times in books scanned by Google. See Reference: Google Ngram project.

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