@misc{indiciaea07d2f04e9a7,
  title = {Surficial geologic map of the greater Omaha area, Nebraska and Iowa},
  author = {R. R. Shroba and T. R. Brandt and J.C. Blossom},
  year = {2001},
  doi = {10.3133/mf2391},
  url = {https://pubs.usgs.gov/publication/mf2391},
  note = {Source identifier: mf2391}
}