The day before International Women's Day, Forbes magazine released its annual billionaires list for 2012 headed, predictably, by men. But this year, 14 of the richest 100 were women. In honor of International Women’s Day, here’s a countdown of the Top 10, a list that includes a few mining tycoons, a media mogul, and a pair of Wal-Mart heiresses. Which wealthy woman snagged the top spot?
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