Usage History of 'boltonia'

The following chart shows how frequently 'boltonia' appeared in printed materials over time. For example, the word 'boltonia' occurred 6 times in books in 1809 and 300 times in 2008. From 1809 to 2008, the word 'boltonia' was used a total of 10,296 times in books scanned by Google. See Reference: Google Ngram project.

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