Usage History of 'pteridosperms'

The following chart shows how frequently 'pteridosperms' appeared in printed materials over time. For example, the word 'pteridosperms' occurred 2 times in books in 1862 and 410 times in 2008. From 1862 to 2008, the word 'pteridosperms' was used a total of 18,897 times in books scanned by Google. See Reference: Google Ngram project.

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