Usage History of 'softwood'

The following chart shows how frequently 'softwood' appeared in printed materials over time. For example, the word 'softwood' occurred 2 times in books in 1793 and 10,325 times in 2008. From 1793 to 2008, the word 'softwood' was used a total of 412,663 times in books scanned by Google. See Reference: Google Ngram project.

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