These papers
and presentations are about the External Tank (ET) which gives you an idea
of their history, the components they are made of and how they are made,
and what they could be used for in the future. Now, they just burn up in
the atmoshpere and fall into the ocean.
The presentations
were made with PowerPoint which gives you a good overview of the ET along
with some good pictures. The papers have more detail and include many references
that deal with the ET.