Usage History of 'lumpers'

The following chart shows how frequently 'lumpers' appeared in printed materials over time. For example, the word 'lumpers' occurred 2 times in books in 1794 and 1,009 times in 2008. From 1794 to 2008, the word 'lumpers' was used a total of 33,965 times in books scanned by Google. See Reference: Google Ngram project.

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