Usage History of 'nanogram'

The following chart shows how frequently 'nanogram' appeared in printed materials over time. For example, the word 'nanogram' occurred 4 times in books in 1869 and 974 times in 2008. From 1869 to 2008, the word 'nanogram' was used a total of 44,234 times in books scanned by Google. See Reference: Google Ngram project.

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