Usage History of 'doublets'

The following chart shows how frequently 'doublets' appeared in printed materials over time. For example, the word 'doublets' occurred 2 times in books in 1584 and 11,643 times in 2008. From 1584 to 2008, the word 'doublets' was used a total of 407,967 times in books scanned by Google. See Reference: Google Ngram project.

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