Usage History of 'rhizobia'

The following chart shows how frequently 'rhizobia' appeared in printed materials over time. For example, the word 'rhizobia' occurred 6 times in books in 1893 and 3,415 times in 2008. From 1893 to 2008, the word 'rhizobia' was used a total of 131,629 times in books scanned by Google. See Reference: Google Ngram project.

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