Usage History of 'diazines'

The following chart shows how frequently 'diazines' appeared in printed materials over time. For example, the word 'diazines' occurred 6 times in books in 1895 and 60 times in 2008. From 1895 to 2008, the word 'diazines' was used a total of 2,523 times in books scanned by Google. See Reference: Google Ngram project.

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