Usage History of 'illuvial'

The following chart shows how frequently 'illuvial' appeared in printed materials over time. For example, the word 'illuvial' occurred 2 times in books in 1830 and 556 times in 2008. From 1830 to 2008, the word 'illuvial' was used a total of 36,816 times in books scanned by Google. See Reference: Google Ngram project.

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