http://dbpedia.org/resource/German_Type_Mittel_U_submarine
http://dbpedia.org/resource/German_Type_U_151_submarine
http://dbpedia.org/resource/German_Type_U_31_submarine
http://dbpedia.org/resource/German_Type_UC_I_submarine
http://dbpedia.org/resource/SM_U-64_(Germany)
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http://dbpedia.org/resource/German_Type_UE_I_submarine
http://dbpedia.org/resource/SM_US-1
http://dbpedia.org/resource/German_Type_U_139_submarine
http://dbpedia.org/resource/List_of_the_largest_ships_hit_by_U-boats_in_World_War_I
http://dbpedia.org/resource/German_Type_U_81_submarine
http://dbpedia.org/resource/German_Type_U_87_submarine
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http://dbpedia.org/resource/SM_U-36
http://dbpedia.org/resource/German_Type_UE_II_submarine
http://dbpedia.org/resource/SM_U-153
http://dbpedia.org/resource/SM_U-158
http://dbpedia.org/resource/SM_U-159
http://dbpedia.org/resource/German_submarine_Bremen
http://dbpedia.org/resource/SM_U-34_(Germany)
http://dbpedia.org/resource/SM_U-42
http://dbpedia.org/resource/SM_U-100
http://dbpedia.org/resource/Submarine_aircraft_carrier
http://dbpedia.org/resource/German_Type_U_66_submarine
http://dbpedia.org/resource/German_Type_UC_II_submarine
http://dbpedia.org/resource/German_Type_UC_III_submarine
http://dbpedia.org/resource/German_Type_Large_MS_submarine
