@misc{indiciaef29e90bf5ec6,
  title = {Precambrian basement map of the Trans-Hudson orogen and adjacent terranes, northern Great Plains, U.S.A.},
  author = {P. K. Sims and Z. E. Peterman and T.G. Hildenbrand and S. A. Mahan},
  year = {1991},
  doi = {10.3133/i2214},
  url = {https://pubs.usgs.gov/publication/i2214},
  note = {Source identifier: i2214}
}