Usage History of 'speleologists'

The following chart shows how frequently 'speleologists' appeared in printed materials over time. For example, the word 'speleologists' occurred 4 times in books in 1897 and 144 times in 2008. From 1897 to 2008, the word 'speleologists' was used a total of 7,786 times in books scanned by Google. See Reference: Google Ngram project.

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