Usage History of 'acrogen'

The following chart shows how frequently 'acrogen' appeared in printed materials over time. For example, the word 'acrogen' occurred 4 times in books in 1840 and 7 times in 2008. From 1840 to 2008, the word 'acrogen' was used a total of 413 times in books scanned by Google. See Reference: Google Ngram project.

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