Usage History of 'subtropic'

The following chart shows how frequently 'subtropic' appeared in printed materials over time. For example, the word 'subtropic' occurred 2 times in books in 1866 and 155 times in 2008. From 1866 to 2008, the word 'subtropic' was used a total of 14,244 times in books scanned by Google. See Reference: Google Ngram project.

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