@misc{indiciaeb02a1645fa4c,
  title = {Test drilling in the Walhalla area, Pembina County, North Dakota},
  author = {D. G. Adolphson},
  year = {1960},
  doi = {10.3133/ofr601},
  url = {https://pubs.usgs.gov/publication/ofr601},
  note = {Source identifier: ofr601}
}