Usage History of 'planaria'

The following chart shows how frequently 'planaria' appeared in printed materials over time. For example, the word 'planaria' occurred 2 times in books in 1764 and 981 times in 2008. From 1764 to 2008, the word 'planaria' was used a total of 79,393 times in books scanned by Google. See Reference: Google Ngram project.

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