Usage History of 'sourcebooks'

The following chart shows how frequently 'sourcebooks' appeared in printed materials over time. For example, the word 'sourcebooks' occurred 2 times in books in 1762 and 4,604 times in 2008. From 1762 to 2008, the word 'sourcebooks' was used a total of 63,672 times in books scanned by Google. See Reference: Google Ngram project.

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