Usage History of 'shell'

The following chart shows how frequently 'shell' appeared in printed materials over time. For example, the word 'shell' occurred 2 times in books in 1507 and 916,880 times in 2008. From 1507 to 2008, the word 'shell' was used a total of 24,345,479 times in books scanned by Google. See Reference: Google Ngram project.

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