@misc{indiciaef8e9155cd6bf,
  title = {The Flaxville gravel and its relation to other terrace gravels of the northern Great Plains},
  author = {Arthur J. Collier and W. T. Thom},
  year = {1918},
  doi = {10.3133/pp108j},
  url = {https://pubs.usgs.gov/publication/pp108J},
  note = {Source identifier: pp108J}
}