The Rise and Fall of the Third Reich.

New York: Simon & Schuster, 1960.

Siddiqi, Asif.

The Soviet Human Space Program: A History, 1945-1974.

NASA SP-4409. Washington, D.C.: U.S. Government Printing Office, 1998.

Simpson, Theodore R., ed.

The Space Station: An Idea Whose Time Has Come.

New York: IEEE

Sloop, John L.

Liquid Hydrogen as a

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