@misc{indiciae3cab0c85c592,
  title = {Topographic surveys of selected mine dumps near Silverton and Leadville, Colorado},
  author = {A.S. Hein and D.V. Fitterman},
  year = {1998},
  doi = {10.3133/ofr98588},
  url = {https://pubs.usgs.gov/publication/ofr98588},
  note = {Source identifier: ofr98588}
}