@misc{indiciaeb7dd3575930d,
  title = {The concept of entropy in landscape evolution},
  author = {Luna Bergere Leopold and Walter Basil Langbein},
  year = {1962},
  doi = {10.3133/pp500a},
  url = {https://pubs.usgs.gov/publication/pp500A},
  note = {Source identifier: pp500A}
}