Usage History of 'oolong'

The following chart shows how frequently 'oolong' appeared in printed materials over time. For example, the word 'oolong' occurred 2 times in books in 1682 and 3,348 times in 2008. From 1682 to 2008, the word 'oolong' was used a total of 43,142 times in books scanned by Google. See Reference: Google Ngram project.

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