@misc{indiciaef391bf596657,
  title = {Metallogeny of the midcontinent rift system of North America},
  author = {S. W. Nicholson and W.F. Cannon and K. J. Schulz},
  year = {1992},
  doi = {10.1016/0301-9268(92)90125-8},
  url = {https://pubs.usgs.gov/publication/70017108},
  note = {Source identifier: 70017108}
}