@misc{indiciaee4de58a97e31,
  title = {Plans for a standard region for long focus astrographs},
  author = {Gatewood, G. D. and Fredrick, L. W.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720006797},
  note = {Source identifier: 19720006797}
}