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M. S. M. Saifullah on Twitter: "I bade goodbye to International ICE at Köln Hbf. Köln is a big railway station and sees fairly large traffic. I had 33 minutes of layover
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L.E. Danielson, Characteristics of Engineers and Scientists. Significant for their utilization and motivation. Bureau of Industrial Relations, Report n° 11. Ann Arbor, Bureau of Industrial Relations, The University of Michigan, 1960, XII
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