@misc{indiciae49644d6cc8ad,
  title = {Preliminary results of the U.S. Geological Survey-Iowa Department of Natural Resources Geological Survey Bureau Manson Core Drilling Project},
  author = {Raymond R. Anderson and Jack B. Hartung and Brian J. Witzke and Eugene Merle Shoemaker and David J. Roddy},
  year = {1992},
  doi = {10.1130/spe293-p237},
  url = {https://pubs.usgs.gov/publication/70227571},
  note = {Source identifier: 70227571}
}