@misc{indiciaeac7818b0f400,
  title = {An engineering research and technology program for an evolving, multi-decade Mission to Planet Earth},
  author = {Sadin, Stanley R. and Johnston, Gordon I. and Hudson, Wayne R.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920029812},
  note = {Source identifier: 19920029812}
}