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https://www.gutenberg.org might have this. Some books available are just OCRed. Some are proof read and corrected. Not sure if scanned image sources are available?

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Testing needs some labeled dataset. Is there some good site to find publicly available datasets ?

There is this one to test against Project Gutenberg, but you have to request by mail:

[1] http://ciir.cs.umass.edu/downloads/ocr-evaluation/

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