@misc{indiciaee1f720f3967d,
  title = {Description of rock formations and minerals from holes drilled in Tete des Morts area, Iowa},
  author = {Allen Francis Agnew},
  year = {1952},
  doi = {10.3133/ofr521},
  url = {https://pubs.usgs.gov/publication/ofr521},
  note = {Source identifier: ofr521}
}