Usage History of 'phellogen'

The following chart shows how frequently 'phellogen' appeared in printed materials over time. For example, the word 'phellogen' occurred 52 times in books in 1875 and 442 times in 2008. From 1875 to 2008, the word 'phellogen' was used a total of 30,068 times in books scanned by Google. See Reference: Google Ngram project.

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