@misc{indiciaee3d9a59439e2,
  title = {Map showing areas of potential rockfalls in the Golden Quadrangle, Jefferson County, Colorado},
  author = {H. E. Simpson},
  year = {1973},
  doi = {10.3133/i761c},
  url = {https://pubs.usgs.gov/publication/i761C},
  note = {Source identifier: i761C}
}