@misc{indiciaead99dcf7decd,
  title = {Photogrammetry and altimetry: Part C: frequency distributions of lunar slopes},
  author = {Sherman S.C. Wu and H. J. Moore},
  year = {1972},
  url = {https://pubs.usgs.gov/publication/70042899},
  note = {Source identifier: 70042899}
}