Usage History of 'bombproofs'

The following chart shows how frequently 'bombproofs' appeared in printed materials over time. For example, the word 'bombproofs' occurred 2 times in books in 1776 and 398 times in 2008. From 1776 to 2008, the word 'bombproofs' was used a total of 8,366 times in books scanned by Google. See Reference: Google Ngram project.

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