Usage History of 'unirrigated'

The following chart shows how frequently 'unirrigated' appeared in printed materials over time. For example, the word 'unirrigated' occurred 2 times in books in 1805 and 1,750 times in 2008. From 1805 to 2008, the word 'unirrigated' was used a total of 121,502 times in books scanned by Google. See Reference: Google Ngram project.

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