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In: Down to the Monitor [videorecording] / National Oceanic and Atmospheric Administration, Dept. of, 1980Online videoRecordingZugriff:
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In: Down to the Monitor [motion picture] / National Oceanic and Atmospheric Administration, Dept. of, 1980Online videoRecordingZugriff:
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In: Hazard recognition and avoidance in surface coal mining [motion picture] / Mine Safety and Health Administration, Department of, 1980Online videoRecordingZugriff:
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In: Ground control in surface coal mining [videorecording] / Mine Safety and Health Administration, Department of, 1980Online videoRecordingZugriff:
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In: Ground control in surface coal mining [motion picture] / Mine Safety and Health Administration, Department of, 1980Online videoRecordingZugriff: