@misc{indiciaed6f68779cc5f,
  title = {Map showing man-modified land and man-made deposits in the Golden quadrangle, Jefferson County, Colorado},
  author = {H. E. Simpson},
  year = {1973},
  doi = {10.3133/i761e},
  url = {https://pubs.usgs.gov/publication/i761E},
  note = {Source identifier: i761E}
}