Usage History of 'ivorybills'

The following chart shows how frequently 'ivorybills' appeared in printed materials over time. For example, the word 'ivorybills' occurred 2 times in books in 1876 and 69 times in 2008. From 1876 to 2008, the word 'ivorybills' was used a total of 2,081 times in books scanned by Google. See Reference: Google Ngram project.

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