Sep 102013
An admittedly rather awful-quality CAD diagram of the “Dual Keel” space station configuration as studied by NASA sometime in the late 1980’s. This drawing is noteworthy for sowing what appears to be a very large parabolic antenna, probably a radio antenna or radar dish (seems far too large to be the reflector for a solar power system).
Scanned from a slide at the NASA HQ historical archive.