Usage History of 'keelless'

The following chart shows how frequently 'keelless' appeared in printed materials over time. For example, the word 'keelless' occurred 6 times in books in 1828 and 157 times in 2008. From 1828 to 2008, the word 'keelless' was used a total of 4,841 times in books scanned by Google. See Reference: Google Ngram project.

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