Usage History of 'observatories'

The following chart shows how frequently 'observatories' appeared in printed materials over time. For example, the word 'observatories' occurred 2 times in books in 1708 and 16,766 times in 2008. From 1708 to 2008, the word 'observatories' was used a total of 553,481 times in books scanned by Google. See Reference: Google Ngram project.

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