Usage History of 'bolographs'

The following chart shows how frequently 'bolographs' appeared in printed materials over time. For example, the word 'bolographs' occurred 844 times in books in 1900 and 8 times in 1969. From 1900 to 1969, the word 'bolographs' was used a total of 2,219 times in books scanned by Google. See Reference: Google Ngram project.

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