@misc{indiciae96903581662a,
  title = {Last glacial loess sedimentary system of eastern Nebraska and western Iowa},
  author = {Joseph A. Mason and E. Arthur Bettis and Helen M. Roberts and Daniel R. Muhs and R. M. Joeckel},
  year = {2006},
  url = {https://pubs.usgs.gov/publication/70228818},
  note = {Source identifier: 70228818}
}