Usage History of 'spelaean'

The following chart shows how frequently 'spelaean' appeared in printed materials over time. For example, the word 'spelaean' occurred 160 times in books in 1846 and 2 times in 2007. From 1846 to 2007, the word 'spelaean' was used a total of 404 times in books scanned by Google. See Reference: Google Ngram project.

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