Usage History of 'ufology'

The following chart shows how frequently 'ufology' appeared in printed materials over time. For example, the word 'ufology' occurred 4 times in books in 1900 and 595 times in 2008. From 1900 to 2008, the word 'ufology' was used a total of 17,604 times in books scanned by Google. See Reference: Google Ngram project.

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