@misc{indiciaeb8d71fcec2fd,
  title = {Gravitational spreading of steep-sided ridges ("sackung") in western United States},
  author = {D. H. Radbruch-Hall and D. J. Varnes and W. Z. Savage},
  year = {1976},
  doi = {10.1007/bf02634754},
  url = {https://pubs.usgs.gov/publication/70000761},
  note = {Source identifier: 70000761}
}