Usage History of 'yperite'

The following chart shows how frequently 'yperite' appeared in printed materials over time. For example, the word 'yperite' occurred 3 times in books in 1914 and 269 times in 2008. From 1914 to 2008, the word 'yperite' was used a total of 4,805 times in books scanned by Google. See Reference: Google Ngram project.

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