Usage History of 'whirlybirds'

The following chart shows how frequently 'whirlybirds' appeared in printed materials over time. For example, the word 'whirlybirds' occurred 2 times in books in 1947 and 114 times in 2008. From 1947 to 2008, the word 'whirlybirds' was used a total of 3,480 times in books scanned by Google. See Reference: Google Ngram project.

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