@misc{indiciae2cfbf3d421dc,
  title = {Aerial radiometric color contour maps and composite color map of regional surface concentrations of uranium, potassium, and thorium in Ohio},
  author = {J. S. Duval},
  year = {1987},
  doi = {10.3133/gp966},
  url = {https://pubs.usgs.gov/publication/gp966},
  note = {Source identifier: gp966}
}