@misc{indiciae1e8b5f6f3157,
  title = {Preliminary thorium daughter contour map and profiles of the Hicks Dome area, Hardin County, Illinois},
  author = {James A. Pitkin},
  year = {1974},
  doi = {10.3133/ofr74157},
  url = {https://pubs.usgs.gov/publication/ofr74157},
  note = {Source identifier: ofr74157}
}