The cover shows photo of German-built ocean liner called "Bremen", constructed to work the transatlantic sea route (Bremerhaven – New York). "Bremen" was launched at Bremen during the afternoon of Thursday, 16 August 1928 by President Paul von Hindenburg, only one day after the launch of her sister ship "Europa" at Hamburg. These two ships were considered for their time as the most modern liners in the world. The high speeds and the comfort and luxury level on board made high demands of technical personnel. Each ship required an engineering crew of some 170 men. Luxurious ocean liners that were national symbols and points of prestige during the pre-war years of the 1930s. On 22 August 1939, she began her last voyage to New York. After ten years of service, she had almost 190 transatlantic voyages completed. Between 1939 and 1941 the ship was used for military purposes.