@misc{indiciae0fdf178a8e30,
  title = {Groundwater flow, velocity, and age in a thick, fine-grained till unit in southeastern Wisconsin},
  author = {W.W. Simpkins and K. R. Bradbury},
  year = {1992},
  doi = {10.1016/0022-1694(92)90183-v},
  url = {https://pubs.usgs.gov/publication/70016550},
  note = {Source identifier: 70016550}
}