Usage History of 'speleology'

The following chart shows how frequently 'speleology' appeared in printed materials over time. For example, the word 'speleology' occurred 6 times in books in 1895 and 325 times in 2008. From 1895 to 2008, the word 'speleology' was used a total of 16,204 times in books scanned by Google. See Reference: Google Ngram project.

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