Usage History of 'wellhole'

The following chart shows how frequently 'wellhole' appeared in printed materials over time. For example, the word 'wellhole' occurred 2 times in books in 1774 and 100 times in 2008. From 1774 to 2008, the word 'wellhole' was used a total of 1,727 times in books scanned by Google. See Reference: Google Ngram project.

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