Usage History of 'ironwood'

The following chart shows how frequently 'ironwood' appeared in printed materials over time. For example, the word 'ironwood' occurred 2 times in books in 1736 and 5,043 times in 2008. From 1736 to 2008, the word 'ironwood' was used a total of 160,255 times in books scanned by Google. See Reference: Google Ngram project.

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