Usage History of 'bioherm'

The following chart shows how frequently 'bioherm' appeared in printed materials over time. For example, the word 'bioherm' occurred 5 times in books in 1927 and 383 times in 2008. From 1927 to 2008, the word 'bioherm' was used a total of 14,599 times in books scanned by Google. See Reference: Google Ngram project.

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