Usage History of 'protozoal'

The following chart shows how frequently 'protozoal' appeared in printed materials over time. For example, the word 'protozoal' occurred 2 times in books in 1852 and 3,735 times in 2008. From 1852 to 2008, the word 'protozoal' was used a total of 113,923 times in books scanned by Google. See Reference: Google Ngram project.

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