Usage History of 'concentering'

The following chart shows how frequently 'concentering' appeared in printed materials over time. For example, the word 'concentering' occurred 2 times in books in 1747 and 165 times in 2008. From 1747 to 2008, the word 'concentering' was used a total of 3,323 times in books scanned by Google. See Reference: Google Ngram project.

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