@misc{indiciae33bcc826b3ca,
  title = {Altimetric and shaded relief map of Venus},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1981},
  doi = {10.3133/i1324},
  url = {https://pubs.usgs.gov/publication/i1324},
  note = {Source identifier: i1324}
}