Usage History of 'naphtol'

The following chart shows how frequently 'naphtol' appeared in printed materials over time. For example, the word 'naphtol' occurred 6 times in books in 1836 and 232 times in 2008. From 1836 to 2008, the word 'naphtol' was used a total of 12,870 times in books scanned by Google. See Reference: Google Ngram project.

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