Usage History of 'progressional'

The following chart shows how frequently 'progressional' appeared in printed materials over time. For example, the word 'progressional' occurred 2 times in books in 1707 and 363 times in 2008. From 1707 to 2008, the word 'progressional' was used a total of 9,172 times in books scanned by Google. See Reference: Google Ngram project.

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