Usage History of 'topographs'

The following chart shows how frequently 'topographs' appeared in printed materials over time. For example, the word 'topographs' occurred 2 times in books in 1801 and 549 times in 2008. From 1801 to 2008, the word 'topographs' was used a total of 18,174 times in books scanned by Google. See Reference: Google Ngram project.

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