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The Last Years of the Autocracy, excerpted from Glenn E. Curtis (ed.), Russia: A Country Study, Department of the Army. The Wendell H. Ford Government Publications Act of 1998: Hearings Before the Committee on Rules and Administration, United States Senate, One Hundred Fifth Congress, Second Session, on S. 2288 ... Oversight of the Production, Procurement, Dissemination, and Permanent Public Access of the Government's Publications, July 29; September 16, 1998. U.S. Government Printing Office. 1998. ISBN978-0-16-061212-1.
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Garber, Steve (19. 1. 2007). „Sputnik and The Dawn of the Space Age”. NASA. Архивирано из оригинала 30. 04. 2019. г. Приступљено 22. 7. 2007. „History changed on October 4, 1957, when the Soviet Union successfully launched Sputnik I. The world's first artificial satellite ...”