@misc{indiciaea223b3ce1a8b,
  title = {Geologic map of the Ra Patera area of Io},
  author = {Ronald Greeley and P. D. Spudis and J. E. Guest},
  year = {1988},
  doi = {10.3133/i1949},
  url = {https://pubs.usgs.gov/publication/i1949},
  note = {Source identifier: i1949}
}