@misc{indiciae52bf1ff5d31e,
  title = {Techniques for ruling improved large diffraction gratings Final report, 1 Mar. 1966 - 31 Jan. 1971},
  author = {Harrison, G. R.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710007698},
  note = {Source identifier: 19710007698}
}