Reference Page
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2. Chemistry explained - oxygen. http://www.chemistryexplained.com/elements/L-P/Oxygen.html (accessed 12 November 2014).
3. Jeanne Ryba. Liquid oxygen and liquid hydrogen storage. http://www.nasa.gov/mission_pages/shuttle/launch/LOX-LH2-storage.html (accessed 13 November 2014).
4. Liquid hydrogen as a propulsion fuel,1945-1959. http://history.nasa.gov/SP-4404/app-a4.htm (accessed 13 November 2014).
5. Robert A. Braeunig. Rocket propellants. http://www.braeunig.us/space/propel.htm (accessed 13 November 2014).
6. Timeline of hydrogen technologies. http://en.wikipedia.org/wiki/Timeline_of_hydrogen_technologies (accessed 13 November 2014).