@misc{indiciae33bbc7b1a001,
  title = {Studies of longitudinal stream profiles in Virginia and Maryland},
  author = {J.T. Hack},
  year = {1957},
  doi = {10.3133/pp294b},
  url = {https://pubs.usgs.gov/publication/pp294B},
  note = {Source identifier: pp294B}
}