Usage History of 'bioregions'

The following chart shows how frequently 'bioregions' appeared in printed materials over time. For example, the word 'bioregions' occurred 4 times in books in 1964 and 1,213 times in 2008. From 1964 to 2008, the word 'bioregions' was used a total of 18,237 times in books scanned by Google. See Reference: Google Ngram project.

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