Skylab was the first US space station, it was launched into a 435 km (270 miles) altitude orbit on May 14, 1973 as part of the Apollo program.

This 91 ton, 36 meters (4-story) high, 6.7 meters in diameter structure carried three different Apollo crews manned Skylab during its 9 month mission conducting medical experiments, solar observations and detailed Earth resources mapping experiments. Skylab spacecraft reentered the atmosphere on July 11, 1979 scattering debris over the Indian Ocean and the sparsely settled region of Western Australia.

Skylab included eight separate solar experiments; two X-ray telescopes, an X-ray and extreme ultraviolet camera, an ultraviolet spectroheliometer, an extreme ultraviolet spectroheliograph and an ultraviolet spectroheliograph, a white light coronagraph and two hydrogen-alpha telescopes.

Resources Experiments Package S190-B (5" focal length camera)

Skylab Image of the Baltimore - Washington Corridor, with Landsat 1 (ERTS 1) Classification	Holt County Nebraska, Agriculture
Skylab S-190A Sensor vs. Landsat 1 (ERTS 1) MSS Sensor, 1973	Map of the Baltimore - Washington Corridor produced using Skylab S-190B imagery, 1973
Skylab 1973  spectral reflectance clouds and snow	Monte video Uruguay
Skylab S-190B imagery vs. conventional photo for the interpretation of urban areas, 1973.	Land Use Map of the Baltimore - Washington Corridor produced using Skylab data, August 1973.

More Info
http://science.nasa.gov/ssl/pad/solar/skylab.htm
http://www.cas.muohio.edu/~devriepl/phy211/observations/TJ/
http://heasarc.gsfc.nasa.gov/docs/heasarc/missions/skylab.html
http://www.hao.ucar.edu/public/research/mlso/Skylab/skylab_homepage.html