@misc{indiciaec1f8419dac07,
  title = {Summary of discussion of pre-cambrian geochro-nology of Minnesota and adjacent areas},
  author = {S. S. Goldich and A.O. Nier and H. Baadsgaard and J. Hoffman and H.W. Krueger},
  year = {2006},
  doi = {10.1111/j.1749-6632.1961.tb35499.x},
  url = {https://pubs.usgs.gov/publication/70220648},
  note = {Source identifier: 70220648}
}