Usage History of 'thiophens'

The following chart shows how frequently 'thiophens' appeared in printed materials over time. For example, the word 'thiophens' occurred 28 times in books in 1887 and 3 times in 2007. From 1887 to 2007, the word 'thiophens' was used a total of 674 times in books scanned by Google. See Reference: Google Ngram project.

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