Usage History of 'naphtols'

The following chart shows how frequently 'naphtols' appeared in printed materials over time. For example, the word 'naphtols' occurred 6 times in books in 1892 and 6 times in 2008. From 1892 to 2008, the word 'naphtols' was used a total of 891 times in books scanned by Google. See Reference: Google Ngram project.

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