@misc{indiciae19cc7746047f,
  title = {Possible further evidence for 3.8 b.y.-old rocks in the Minnesota River Valley of southwestern Minnesota},
  author = {Samuel S. Goldich and Bruce R. Doe and Maryse Helen Delevaux},
  year = {1975},
  doi = {10.3133/ofr7565},
  url = {https://pubs.usgs.gov/publication/ofr7565},
  note = {Source identifier: ofr7565}
}