Usage History of 'intergrades'

The following chart shows how frequently 'intergrades' appeared in printed materials over time. For example, the word 'intergrades' occurred 2 times in books in 1780 and 453 times in 2008. From 1780 to 2008, the word 'intergrades' was used a total of 37,425 times in books scanned by Google. See Reference: Google Ngram project.

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