Usage History of 'geothermal'

The following chart shows how frequently 'geothermal' appeared in printed materials over time. For example, the word 'geothermal' occurred 4 times in books in 1515 and 41,737 times in 2008. From 1515 to 2008, the word 'geothermal' was used a total of 1,019,840 times in books scanned by Google. See Reference: Google Ngram project.

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