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Top 20 Directory:
Top : Science : Technology : Space : Space_Shuttle : External_Tank
Sites:
  		• Orbit 6 - Space Technology and Fiction: Includes links regarding the proposed usage of ET, and technical papers.
  		• External Tank Manual: Features extract from the shuttle reference manual.
  		• PERUN - Space Shuttle External Tank Used as a Space Station: Paper written in 1979 deals with the possibility of converting an expended Space Shuttle External Tank into a Space Station.
  		• Re-using today's rockets spent fuel tanks in orbit: Technical website
  		• Space Island Group Project: Features a project descriptions for building a space station devoted to tourism and 0-G experiments, based on the tanks of the space shuttle. Regularly updated.
  		• Space Shuttle External Tank Applications: Overview of possible applications of Space Shuttle External Tank
  		• Space Shuttle External Tank Applications: Offers a collection of articles arguing for several applications and re-use of the tank.
  		• Studies: Studies by L5 Minnesota (MN Space Frontier Society)- Uses for Shuttle External Tank in orbit
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