Usage History of 'obversion'

The following chart shows how frequently 'obversion' appeared in printed materials over time. For example, the word 'obversion' occurred 6 times in books in 1819 and 834 times in 2008. From 1819 to 2008, the word 'obversion' was used a total of 21,911 times in books scanned by Google. See Reference: Google Ngram project.

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