Usage History of 'tronas'

The following chart shows how frequently 'tronas' appeared in printed materials over time. For example, the word 'tronas' occurred 2 times in books in 1852 and 2 times in 2007. From 1852 to 2007, the word 'tronas' was used a total of 275 times in books scanned by Google. See Reference: Google Ngram project.

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