Usage History of 'indole'

The following chart shows how frequently 'indole' appeared in printed materials over time. For example, the word 'indole' occurred 2 times in books in 1698 and 7,755 times in 2008. From 1698 to 2008, the word 'indole' was used a total of 393,611 times in books scanned by Google. See Reference: Google Ngram project.

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