@misc{indiciaee74870cecdd4,
  title = {Operational planning for global earth surveys using space vehicles},
  author = {Barmby, J. G. and Bock, P. and Dubinsky, R.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700047646},
  note = {Source identifier: 19700047646}
}