@misc{indiciae465765cb88da,
  title = {Digital shaded-relief image of the Mediterranean Sea floor available as continuous-tone photographic prints from a film-recorder negative},
  author = {R. K. Mark and Richard J. Pike and Chip P. Stevens},
  year = {1991},
  doi = {10.3133/ofr91428},
  url = {https://pubs.usgs.gov/publication/ofr91428},
  note = {Source identifier: ofr91428}
}