Oil covers a pond along side the Yellowstone River in Laurel, Mont., Tuesday July 5, 2011. An ExxonMobil pipeline near Laurel, Montana ruptured and spilled an estimated 1,000 barrels of crude into the Yellowstone. (AP Photo/Jim Urquhart)

Associated Press
Oil covers a pond along side the Yellowstone River in Laurel, Mont., Tuesday July 5, 2011.  An ExxonMobil pipeline near Laurel, Montana ruptured and spilled an estimated 1,000 barrels of crude into the Yellowstone. (AP Photo/Jim Urquhart)
Oil covers a pond along side the Yellowstone River in Laurel, Mont., Tuesday July 5, 2011. An ExxonMobil pipeline near Laurel, Montana ruptured and spilled an estimated 1,000 barrels of crude into the Yellowstone. (AP Photo/Jim Urquhart)
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