Usage History of 'corundum'

The following chart shows how frequently 'corundum' appeared in printed materials over time. For example, the word 'corundum' occurred 2 times in books in 1679 and 7,022 times in 2008. From 1679 to 2008, the word 'corundum' was used a total of 329,040 times in books scanned by Google. See Reference: Google Ngram project.

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