Doppler Effect - Information Derived from It / Description of Sputniks 1 and 2 / Sputnik 1, Alone / Sputnik 1, Showing Doppler Effect
Explorer 1 / Telemetering Signals
Vanguard (Second Attempt)
Modulation from Explorer 1
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© 2004 Smithsonian Folkways Recordings / 1958 Folkways Records