@misc{indiciae18cfc622f00e,
  title = {Persistent dust cloud activity on Mars near Echus Chasma in 1978},
  author = {Martin, Leonard J. and James, Philip B.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890040716},
  note = {Source identifier: 19890040716}
}