Usage History of 'phenanthrenes'

The following chart shows how frequently 'phenanthrenes' appeared in printed materials over time. For example, the word 'phenanthrenes' occurred 2 times in books in 1925 and 295 times in 2008. From 1925 to 2008, the word 'phenanthrenes' was used a total of 6,803 times in books scanned by Google. See Reference: Google Ngram project.

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