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FILE - This Dec. 11, 2013 file photo shows National Transportation Safety Board (NTSB) Chair Deborah Hersman speaking in Washington. An effort by government and industry to make the tank cars used to ship crude oil and ethanol safer, spurred by a series of fiery train crashes, is becoming mired in squabbling and finger-pointing. The Department of Transportation, concerned about the potential for catastrophic accidents involving oil and ethanol trains that are sometimes as many as 100 cars long, is drafting new tank car regulations aimed at making the cars less likely to spill their contents in the event of a crash. But final regulations aren’t expected until the end of the year at the earliest, and it is common for such government rulemakings to drag on for years. (AP Photo/Jacquelyn Martin, File)
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FILE - This Dec. 30, 2013 file photo shows a fireball going up at the site of an oil train derailment in Casselton, N.D. An effort by government and industry to make the tank cars used to ship crude oil and ethanol safer, spurred by a series of fiery train crashes, is becoming mired in squabbling and finger-pointing. The Department of Transportation, concerned about the potential for catastrophic accidents involving oil and ethanol trains that are sometimes as many as 100 cars long, is drafting new tank car regulations aimed at making the cars less likely to spill their contents in the event of a crash. But final regulations aren’t expected until the end of the year at the earliest, and it is common for such government rulemakings to drag on for years. (AP Photo/Bruce Crummy, File)
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FILE - This combination made from file photos provided by the National Institute of Health, Pasteur Institute shows, at top, a form of human T-cell leukemia virus, or HTLV, discovered by U.S. Dr. Robert Gallo and his team at the National Cancer Institute, a division of the National Institute of Health in Bethesda, Md. The image at bottom shows a lymphadenopathy-associated virus, or LAV, discovered by French Dr. Luc Montagnier of the Pasteur Institute. Both Gallo and Montagnier are credited with isolating the HIV virus that causes AIDS, or the human immunodeficiency virus. The discovery was announced 30 years ago, on April 23, 1984, at a news conference in Washington. (AP Photo/National Institute of Health, Pasteur Institute, File)
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ADVANCE FOR USE TUESDAY, APRIL 29, 2014 AND THEREAFTER - In this Thursday, Feb. 27, 2014 photo, new modular homes are seen behind an old house, right, in Grenora, N.D. Not so long ago, small towns in North Dakota were slowly dying. But a new oil boom has changed all that and brought new life to the area known as the Baaken. (AP Photo/Martha Irvine)
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ADVANCE FOR USE TUESDAY, APRIL 29, 2014 AND THEREAFTER - In this Wednesday, Feb. 26, 2014 photo, Gordon Levang, 95, holds a photo of one of his family's longtime homes in Watford City, N.D. A retired farmer who now lives in that home in town, Levang says the population growth and development in the area has been astounding for a town that once had 1,500 residents and now has as many as 7,000 in the town and its outskirts. As a lifelong resident of the area, and even though there were two other booms in the region, he says he's never seen anything like this. He says oil has been found on his family's farm outside town in all three oil booms. (AP Photo/Martha Irvine)
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ADVANCE FOR USE TUESDAY, APRIL 29, 2014 AND THEREAFTER - In this Wednesday, Feb. 26, 2014 photo, traffic, much of it related to the oil industry, lines up behind a stoplight on a road into Watford City, N.D. The lack of roads to handle the traffic, which is present day and night, and accidents that result, are a common complaint from residents in the region. (AP Photo/Martha Irvine)
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In this Thursday, April 10, 2014 photo, Dominion Resources Inc. nuclear power station plant manager, Roy Simmons talks about his participation in a wellness program at the plant in Surry, Va. Dominion started offering a $400 premium credit a couple of years ago for employees who agreed to have a health assessment. (AP Photo/Steve Helber)
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In this photo taken on Tuesday, April 22, 2014, oak trees stand against the sky at the Arbor Lodge State Historical Park and Arboretum in Nebraska City. People across the nation will observe Arbor Day on Friday, but no state will celebrate with as much fervor as Nebraska, where the celebration of trees got its start 142 years ago. (AP Photo/Nati Harnik)
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In this photo taken on Tuesday, April 22, 2014, a volunteer cleanup crew consisting of Nebraska City residents from left: Gloria Chaney, Annette Gaskill and Andrea Cullin, search for fallen tree branches and debris at the Arbor Lodge State Historical Park and Arboretum in Nebraska City. People across the nation will observe Arbor Day on Friday, but no state will celebrate with as much fervor as Nebraska, where the celebration of trees got its start 142 years ago. (AP Photo/Nati Harnik)
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In this photo taken on April 18, 2014, educator Pam Cheever holds a serviceberry seedling, one of about 10,000 seedling trees distributed by the Papio-Missouri River Natural Resources District to school teachers and youth group leaders in Omaha, Neb. The seedlings are to be given to students to take home for Arbor Day plantings. People across the nation will observe Arbor Day on Friday, but no state will celebrate with as much fervor as Nebraska, where the celebration of trees got its start 142 years ago. (AP Photo/Nati Harnik)
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In this photo taken on Tuesday, April 22, 2104, a flowering tree adorns Steinhart Park in Nebraska City, Neb. People across the nation will observe Arbor Day on Friday, but no state will celebrate with as much fervor as Nebraska, where the celebration of trees got its start 142 years ago. The epicenter of that devotion is in Nebraska City, where the Arbor Day Foundation is based. (AP Photo/Nati Harnik)
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In this photo taken on Tuesday, April 22, 2104, 12 year-old Justin Smallfoot, of Nebraska City, picks up fallen tree branches at the Arbor Lodge State Historical Park and Arboretum in Nebraska City, Neb. People across the nation will observe Arbor Day on Friday, but no state will celebrate with as much fervor as Nebraska, where the celebration of trees got its start 142 years ago. (AP Photo/Nati Harnik)
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In this photo taken on Tuesday, April 22, 2104, a large Bur Oak tree towers over a pond in Steinhart Park in Nebraska City, Neb. People across the nation will observe Arbor Day on Friday, but no state will celebrate with as much fervor as Nebraska, where the celebration of trees got its start 142 years ago. The epicenter of that devotion is in Nebraska City, where the Arbor Day Foundation is based. (AP Photo/Nati Harnik)
