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A fact from List of largest libraries in the United States appeared on Wikipedia's Main Page in the Did you know column on 24 August 2011 (check views). The text of the entry was as follows:
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It might be better to title this list something along the lines of "largest library systems" rather than "largest libraries". Some of the listings, the Boston Public Library for example, are single buildings containing a more or less unified collection, but others are entire library consortia spread out over a significant geographic area. These categories don't seem reasonably comparable.