@misc{indiciae6556ee48fd48,
  title = {North polar region of Mars: Imaging results from Viking 2},
  author = {J.A. Cutts and K.R. Blasius and G.A. Briggs and M. H. Carr and Ronald Greeley and Harold Masursky},
  year = {1974},
  doi = {10.1126/science.194.4271.1329},
  url = {https://pubs.usgs.gov/publication/70209872},
  note = {Source identifier: 70209872}
}