Usage History of 'richens'

The following chart shows how frequently 'richens' appeared in printed materials over time. For example, the word 'richens' occurred 2 times in books in 1761 and 584 times in 2008. From 1761 to 2008, the word 'richens' was used a total of 25,397 times in books scanned by Google. See Reference: Google Ngram project.

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