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I use tesseract, which gives decent to very good results if the scans are half-decent. ABBYY gives appreciably better results, admittedly, but I haven't found anything better that's free. I use regexp quite a lot for initial OCR cleanup, I'll see if I can't find a list of standard expressions somewhere. Another trick I often use is word frequency, words that only occur once or twice are pretty often suspect. But I'd be stumped at output like the ones you show. May I ask what OCR you used?
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