@misc{indiciae84df9b2252a1,
  title = {Reconnaissance for radioactivity in the Gold Hill mining area, Boulder county, Colorado},
  author = {R. H. Campbell},
  year = {1955},
  doi = {10.3133/tem563},
  url = {https://pubs.usgs.gov/publication/tem563},
  note = {Source identifier: tem563}
}