Usage History of 'sourdough'

The following chart shows how frequently 'sourdough' appeared in printed materials over time. For example, the word 'sourdough' occurred 4 times in books in 1855 and 8,081 times in 2008. From 1855 to 2008, the word 'sourdough' was used a total of 189,443 times in books scanned by Google. See Reference: Google Ngram project.

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