Carl sagan

More by Ray Spangenburg

• Niels Bohr

  

  Niels Bohr

  2 readers 1995

• A look at Saturn

  

  A look at Saturn

  1 readers 2001

• Alan Turing

  

  Alan Turing

  1 readers 2008

• Chien-Shiung Wu

  

  Chien-Shiung Wu

  1 readers 2008

• Disease Fighters Since 1950 (Global Profiles)

  

  Disease Fighters Since 1950 (Global Profiles)

  1 readers 1997

• Richard Feynman

  

  Richard Feynman

  1 readers 2008

• The Hubble Space Telescope (Out of This World)

  

  The Hubble Space Telescope (Out of This World)

  1 readers 2002