Usage History of 'bizonal'

The following chart shows how frequently 'bizonal' appeared in printed materials over time. For example, the word 'bizonal' occurred 2 times in books in 1920 and 628 times in 2008. From 1920 to 2008, the word 'bizonal' was used a total of 26,488 times in books scanned by Google. See Reference: Google Ngram project.

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