Usage History of 'unidentified'

The following chart shows how frequently 'unidentified' appeared in printed materials over time. For example, the word 'unidentified' occurred 2 times in books in 1574 and 70,238 times in 2008. From 1574 to 2008, the word 'unidentified' was used a total of 2,070,541 times in books scanned by Google. See Reference: Google Ngram project.

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