Usage History of 'nanograms'

The following chart shows how frequently 'nanograms' appeared in printed materials over time. For example, the word 'nanograms' occurred 2 times in books in 1861 and 950 times in 2008. From 1861 to 2008, the word 'nanograms' was used a total of 34,919 times in books scanned by Google. See Reference: Google Ngram project.

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