Usage History of 'naphthenic'

The following chart shows how frequently 'naphthenic' appeared in printed materials over time. For example, the word 'naphthenic' occurred 2 times in books in 1900 and 733 times in 2008. From 1900 to 2008, the word 'naphthenic' was used a total of 73,677 times in books scanned by Google. See Reference: Google Ngram project.

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