Usage History of 'retardants'

The following chart shows how frequently 'retardants' appeared in printed materials over time. For example, the word 'retardants' occurred 2 times in books in 1885 and 4,431 times in 2008. From 1885 to 2008, the word 'retardants' was used a total of 124,355 times in books scanned by Google. See Reference: Google Ngram project.

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