Usage History of 'pneumonitis'

The following chart shows how frequently 'pneumonitis' appeared in printed materials over time. For example, the word 'pneumonitis' occurred 36 times in books in 1822 and 11,086 times in 2008. From 1822 to 2008, the word 'pneumonitis' was used a total of 444,298 times in books scanned by Google. See Reference: Google Ngram project.

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