Usage History of 'pteridology'

The following chart shows how frequently 'pteridology' appeared in printed materials over time. For example, the word 'pteridology' occurred 2 times in books in 1854 and 47 times in 2008. From 1854 to 2008, the word 'pteridology' was used a total of 2,189 times in books scanned by Google. See Reference: Google Ngram project.

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