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P. Sveistrup P. Koopmans, T.: TANKER FREIGHT RATES AND TANKSHIP BUILDING. An Analyses cyclical fluctuations. Haarlem & London 1939. nt [Internet]. 1. januar 1940 [henvist 22. november 2024];3. Tilgængelig hos: https://tidsskrift.dk/nationaloekonomisktidsskrift/article/view/60080