Usage History of 'phellogens'

The following chart shows how frequently 'phellogens' appeared in printed materials over time. For example, the word 'phellogens' occurred 4 times in books in 1884 and 14 times in 2008. From 1884 to 2008, the word 'phellogens' was used a total of 929 times in books scanned by Google. See Reference: Google Ngram project.

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