Usage History of 'unreinforced'

The following chart shows how frequently 'unreinforced' appeared in printed materials over time. For example, the word 'unreinforced' occurred 2 times in books in 1842 and 2,897 times in 2008. From 1842 to 2008, the word 'unreinforced' was used a total of 114,174 times in books scanned by Google. See Reference: Google Ngram project.

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