Usage History of 'arboretums'

The following chart shows how frequently 'arboretums' appeared in printed materials over time. For example, the word 'arboretums' occurred 2 times in books in 1835 and 497 times in 2008. From 1835 to 2008, the word 'arboretums' was used a total of 13,753 times in books scanned by Google. See Reference: Google Ngram project.

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