@misc{indiciae5de703473a8a,
  title = {Distribution and relationships of 4-10 km diameter craters to global geologic units on Mars},
  author = {Christopher D. Condit},
  year = {1977},
  doi = {10.3133/ofr77421},
  url = {https://pubs.usgs.gov/publication/ofr77421},
  note = {Source identifier: ofr77421}
}