Usage History of 'trogons'

The following chart shows how frequently 'trogons' appeared in printed materials over time. For example, the word 'trogons' occurred 2 times in books in 1809 and 862 times in 2008. From 1809 to 2008, the word 'trogons' was used a total of 24,695 times in books scanned by Google. See Reference: Google Ngram project.

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