there was exactly 4
http://en.wikipedia.org/wiki/Skylab
skylab
The skylab returned on July 11,1979
Skylab was intentionally deorbited and crashed in Australia on 11 July 1979.
there was exactly 4
http://en.wikipedia.org/wiki/Skylab
sKyLaB
skylab
skylab was built in may,1973
skylab
Skylab I was launched on 14 May 1973.
The skylab returned on July 11,1979
One of my projects is aboard the Skylab.
All total Theres been three Mir, Skylab and the ISS. Mir and Skylab burned up so onlt the ISS is up there
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