@misc{indiciae4d6d8dfc1790,
  title = {Pre-Wisconsin glacial stratigraphy of the central plains region in Iowa, Nebraska, Kansas, and Missouri},
  author = {G.R. Hallberg},
  year = {1986},
  url = {https://pubs.usgs.gov/publication/70014579},
  note = {Source identifier: 70014579}
}