HAROLD HAMM, 65, AND AUBREY MCCLENDON, 51, are two billionaires who made their fortunes in the oil and gas business. Two of Oklahoma's richest sons (with net worths of roughly $8.5 billion and $1.3 billion, respectively), they've been crossing paths in the midwestern oil patch for more than 20 years. They're friendly enough that when their companies do deals they e-mail each other to iron out details—who needs lawyers?
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