Usage History of 'tubules'

The following chart shows how frequently 'tubules' appeared in printed materials over time. For example, the word 'tubules' occurred 4 times in books in 1718 and 30,130 times in 2008. From 1718 to 2008, the word 'tubules' was used a total of 1,975,037 times in books scanned by Google. See Reference: Google Ngram project.

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