@misc{indiciae365e117d0b08,
  title = {Space Shuttle external tank: Today - DDT \& E: Tomorrow - Production},
  author = {Norton, A. M. and Tanner, E. J.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800032269},
  note = {Source identifier: 19800032269}
}