@misc{indiciae2926e2d6fe17,
  title = {Tectonic significance of precambrian apatite fission-track ages from the midcontinent United States},
  author = {K.D. Crowley and C. W. Naeser and C.A. Babel},
  year = {1986},
  doi = {10.1016/0012-821x(86)90189-5},
  url = {https://pubs.usgs.gov/publication/70015706},
  note = {Source identifier: 70015706}
}