Usage History of 'sonography'

The following chart shows how frequently 'sonography' appeared in printed materials over time. For example, the word 'sonography' occurred 2 times in books in 1880 and 17,500 times in 2008. From 1880 to 2008, the word 'sonography' was used a total of 403,364 times in books scanned by Google. See Reference: Google Ngram project.

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