References

1. http://www.nasm.si.edu/exhibitions/gal100/exp1.html

2. Reginald Turnill, The Observer's Spaceflight Directory. Frederick Warne, London, 1978.

3. Robert Godwin, ed., Dyna-Soar: Hypersonic Strategic Weapons System. Apogee Books, 2003.

4. http://en.wikipedia.org/wiki/Hermes_%28shuttle%29

5. http://www.globalsecurity.org/space/Library/report/gao/nsiad92005/part03.htm

6. http://en.wikipedia.org/wiki/HOPE-X

7. http://www.russianspaceweb.com/kliper.html

8. http://en.wikipedia.org/wiki/Kliper

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