@misc{indiciae5156a7fb18cb,
  title = {Post-Apollo lunar mission planning.},
  author = {Downey, J., III and Tiffany, O. L. and Zaitzeff, E.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19670061415},
  note = {Source identifier: 19670061415}
}