Usage History of 'preboard'

The following chart shows how frequently 'preboard' appeared in printed materials over time. For example, the word 'preboard' occurred 4 times in books in 1903 and 56 times in 2008. From 1903 to 2008, the word 'preboard' was used a total of 1,288 times in books scanned by Google. See Reference: Google Ngram project.

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