@misc{indiciae865ae8a3d470,
  title = {Aeroradioactivity map of the Chicago area, Illinois and Indiana},
  author = {G.M. Flint and J. A. Pitkin},
  year = {1970},
  doi = {10.3133/gp681},
  url = {https://pubs.usgs.gov/publication/gp681},
  note = {Source identifier: gp681}
}