Usage History of 'niobic'

The following chart shows how frequently 'niobic' appeared in printed materials over time. For example, the word 'niobic' occurred 4 times in books in 1802 and 40 times in 2008. From 1802 to 2008, the word 'niobic' was used a total of 6,747 times in books scanned by Google. See Reference: Google Ngram project.

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