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1Published 1982“...Ministry of Energy,...”
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4Published 1984“...Ministry of Energy],...”
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5Published 1980“...The Ministry of Energy,...”
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6Published 1979“...Ministry of Energy,...”
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8Published 1981“...Ministry of Energy,...”
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11Published 1983“...Ministry of Energy,...”
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12Published 1983“...Ministry of Energy],...”
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17Published 1983“...Ministry of Energy,...”
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18Published 1981“...Ministry of Energy,...”
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19Published 1983“...Ministry of Energy,...”
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