4 of 15: A person walks on top of a parking garage as a plow drives on a street below as a steady snow falls Thursday, Feb. 21, 2013, in St. Louis. Blinding snow bombarded much of the nation's midsection Thursday, causing whiteout conditions, making major roadways all but impassable and shutting down schools and state legislatures. (AP Photo/Jeff Roberson) (AP Photo/ Jeff Roberson)

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