Usage History of 'pneumonic'

The following chart shows how frequently 'pneumonic' appeared in printed materials over time. For example, the word 'pneumonic' occurred 1 time in books in 1731 and 5,447 times in 2008. From 1731 to 2008, the word 'pneumonic' was used a total of 234,149 times in books scanned by Google. See Reference: Google Ngram project.

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