@misc{indiciae60d789cea8f3,
  title = {Automated /unmanned/ Mars sample return missions.},
  author = {Dockery, J. T. and Niehoff, J. C. and Roberts, D. L.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19680030870},
  note = {Source identifier: 19680030870}
}