Usage History of 'picograms'

The following chart shows how frequently 'picograms' appeared in printed materials over time. For example, the word 'picograms' occurred 2 times in books in 1857 and 353 times in 2008. From 1857 to 2008, the word 'picograms' was used a total of 15,701 times in books scanned by Google. See Reference: Google Ngram project.

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