Usage History of 'psilophytes'

The following chart shows how frequently 'psilophytes' appeared in printed materials over time. For example, the word 'psilophytes' occurred 8 times in books in 1909 and 52 times in 2008. From 1909 to 2008, the word 'psilophytes' was used a total of 5,015 times in books scanned by Google. See Reference: Google Ngram project.

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