Usage History of 'earthworms'

The following chart shows how frequently 'earthworms' appeared in printed materials over time. For example, the word 'earthworms' occurred 2 times in books in 1592 and 19,020 times in 2008. From 1592 to 2008, the word 'earthworms' was used a total of 575,341 times in books scanned by Google. See Reference: Google Ngram project.

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