@misc{indiciae7a4c770cc7e3,
  title = {A space communication study Progress report, 15 Sep. 1966 - 15 Mar. 1967},
  author = {Clarke, K. K. and Pickholtz, R. L. and Schilling, D. L.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670018306},
  note = {Source identifier: 19670018306}
}