Usage History of 'strongholds'

The following chart shows how frequently 'strongholds' appeared in printed materials over time. For example, the word 'strongholds' occurred 6 times in books in 1575 and 40,932 times in 2008. From 1575 to 2008, the word 'strongholds' was used a total of 1,024,150 times in books scanned by Google. See Reference: Google Ngram project.

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