Usage History of 'naphthol'

The following chart shows how frequently 'naphthol' appeared in printed materials over time. For example, the word 'naphthol' occurred 2 times in books in 1840 and 5,042 times in 2008. From 1840 to 2008, the word 'naphthol' was used a total of 259,053 times in books scanned by Google. See Reference: Google Ngram project.

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