Usage History of 'counterspy'

The following chart shows how frequently 'counterspy' appeared in printed materials over time. For example, the word 'counterspy' occurred 4 times in books in 1812 and 361 times in 2008. From 1812 to 2008, the word 'counterspy' was used a total of 15,225 times in books scanned by Google. See Reference: Google Ngram project.

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