Usage History of 'guanos'

The following chart shows how frequently 'guanos' appeared in printed materials over time. For example, the word 'guanos' occurred 2 times in books in 1707 and 810 times in 2008. From 1707 to 2008, the word 'guanos' was used a total of 17,475 times in books scanned by Google. See Reference: Google Ngram project.

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