Usage History of 'southbound'

The following chart shows how frequently 'southbound' appeared in printed materials over time. For example, the word 'southbound' occurred 2 times in books in 1750 and 6,721 times in 2008. From 1750 to 2008, the word 'southbound' was used a total of 190,810 times in books scanned by Google. See Reference: Google Ngram project.

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