Usage History of 'hafnium'

The following chart shows how frequently 'hafnium' appeared in printed materials over time. For example, the word 'hafnium' occurred 2 times in books in 1832 and 1,620 times in 2008. From 1832 to 2008, the word 'hafnium' was used a total of 135,177 times in books scanned by Google. See Reference: Google Ngram project.

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