Usage History of 'encyclicals'

The following chart shows how frequently 'encyclicals' appeared in printed materials over time. For example, the word 'encyclicals' occurred 6 times in books in 1820 and 4,784 times in 2008. From 1820 to 2008, the word 'encyclicals' was used a total of 160,400 times in books scanned by Google. See Reference: Google Ngram project.

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