Usage History of 'scratchboards'

The following chart shows how frequently 'scratchboards' appeared in printed materials over time. For example, the word 'scratchboards' occurred 2 times in books in 1941 and 12 times in 2007. From 1941 to 2007, the word 'scratchboards' was used a total of 270 times in books scanned by Google. See Reference: Google Ngram project.

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