@misc{indiciaed6ea2ce0bd64,
  title = {Chemical, semi-quantitative, spectrographic, heavy-mineral analyses of rock and water samples and a table of selected dry holes and producing wells from the Williston basin},
  author = {N.M. Denson and James R. Gill},
  year = {1965},
  doi = {10.3133/ofr6540},
  url = {https://pubs.usgs.gov/publication/ofr6540},
  note = {Source identifier: ofr6540}
}