@article{7623,
      url = {http://library.usi.edu/record/7623},
      title = {Skylab explores the Earth /},
      publisher = {Scientific and Technical Information Office, National  Aeronautics and Space Administration,},
      recid = {7623},
      pages = {xii, 517 p. :},
      address = {Washington :},
      year = {1977},
}