Usage History of 'phosgenes'

The following chart shows how frequently 'phosgenes' appeared in printed materials over time. For example, the word 'phosgenes' occurred 4 times in books in 1876 and 4 times in 2008. From 1876 to 2008, the word 'phosgenes' was used a total of 310 times in books scanned by Google. See Reference: Google Ngram project.

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