@misc{indiciaed530f85416a3,
  title = {Geology and ground-water resources of Clayton County, Iowa},
  author = {W. L. Steinhilber and O. J. Van Eck and A.J. Feulner},
  year = {1961},
  url = {https://pubs.usgs.gov/publication/70174095},
  note = {Source identifier: 70174095}
}