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Buchhandel.de is the independent portal for book readers and book buyers: It provides the research in the VLB (List of Deliverable books) with over 1,200,000 books, videos, audio books, calendars and software.
The usage data:
Januar 2011: 495.685 Visits und 1.976.683 Page Impressions
Februar 2011: 436.125 Visits und 1.872.642 Page Impressions
Quelle: http://www.buchhandel.de