Usage History of 'subfields'

The following chart shows how frequently 'subfields' appeared in printed materials over time. For example, the word 'subfields' occurred 2 times in books in 1799 and 6,699 times in 2008. From 1799 to 2008, the word 'subfields' was used a total of 160,089 times in books scanned by Google. See Reference: Google Ngram project.

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