Usage History of 'zonal'

The following chart shows how frequently 'zonal' appeared in printed materials over time. For example, the word 'zonal' occurred 2 times in books in 1698 and 18,608 times in 2008. From 1698 to 2008, the word 'zonal' was used a total of 1,082,787 times in books scanned by Google. See Reference: Google Ngram project.

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