The Skylabprogram was the first and single Orbitalstation of the NASA..
There have been totally only 4 missions, the first one was the unmanned mission Skylab 1 launched 14 of mai 1973 where a Saturn 5 rocket brought the Skylab in to space and orbit.
The third part of the Saturn 5 rocket , which for the moonflights habe neen used for leaving the Earth gravitation, served in that case as the skylabmodule itself.
After this flight 3 manned spaceflight followed Skylab 2 to Skylab 4 missions where the Saturn 1B rocket brought the well known Apollo spaceships for docking at the skylab module from the first flight.
The last mission was Skylab 4 launched on 16 of november 1973 with Carr, Gibson and Pogue on board.
Due to loss of speed of the orbitalstation and no further mission to the station , Skylab entered on
11 of july 1979 the Earth atmosphere and burned totally.
This was 2 years before the first launch of the Space Shuttle Program which should reach Skylab and should stabilize it.
Skylab 1 launch 14.05.1973 unmanned
Launch of the Skylab orbital station with Saturn-5 rocket
Skylab was slightly demollished during launch
Skylab 2 launch 25.05.1973 Charles Conrad (USA)
landing 22.06.1973 Joseph Kerwin (USA)
Paul Weitz (USA)
Back to Earth crew:
same
Maintenance of the demollished space station by 3 EVA`s
Skylab 3 launch 28.07.1973 Alan Bean (USA)
landing 25.09.1973 Owen Garriott (USA)
Jack Lousma (USA)
Back to Earth crew:
same
Maintenance of the demollished space station by 3 EVA`s
Skylab 4 launch 16.11.1973 Gerald Carr (USA)
landing 08.02.1974 Edward Gibson (USA)
William Pogue (USA)
Back to Earth crew:
same
4 EVA`s