@misc{indiciaeecd23772ab4f,
  title = {Post Apollo manned lunar program},
  author = {Grenning, E. M. and Marion, E. D. and Nahra, J. E. and Orrok, G. T. and Sill, W. R.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19790073829},
  note = {Source identifier: 19790073829}
}