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Space Stamp Youri Gagarine Alexei Leonov Voskhod 2 Souvenir Sheet MNH Mardi Gras Guiné-Bissau Lilies Flowers Souvenir SheetSoviet Spatial Exploration Astronaut Space Voskhod 2 Souvenir Sheet Mint NH The Soviet space program (Russian: , Kosmicheskaya programma SSSR) comprised several of the rocket and space exploration programs conducted by the Soviet Union (USSR) from the 1930s until its collapse in 1991. Over its sixty year history, this primarily classified military program was responsible for a number of pioneering accomplishments in space flight, including the first