Canon : PIXMA Manuals : Scanning Multiple Documents from the ADF (Auto Document Feeder) in Advanced Mode
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Canon Knowledge Base - Scanning Both Sides of a Document Using the ADF (Windows) - TR7520 / TR8520 / TR8620
Amazon.com: Plustek PS30D Duplex Document Scanner: with 50 Sheet Auto Document Feeder (ADF) and searchable PDF Function by Abbyy OCR. Support Mac and PC : Office Products