Usage History of 'gunboat'

The following chart shows how frequently 'gunboat' appeared in printed materials over time. For example, the word 'gunboat' occurred 4 times in books in 1575 and 28,555 times in 2008. From 1575 to 2008, the word 'gunboat' was used a total of 612,223 times in books scanned by Google. See Reference: Google Ngram project.

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