Usage History of 'subzone'

The following chart shows how frequently 'subzone' appeared in printed materials over time. For example, the word 'subzone' occurred 2 times in books in 1870 and 1,040 times in 2008. From 1870 to 2008, the word 'subzone' was used a total of 120,893 times in books scanned by Google. See Reference: Google Ngram project.

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