@misc{indiciaeaae25b427991,
  title = {Preliminary geologic map of the Dagmar No. 4 quadrangle, Montana-North Dakota},
  author = {Irving Jerome Witkind},
  year = {1949},
  doi = {10.3133/ofr4911},
  url = {https://pubs.usgs.gov/publication/ofr4911},
  note = {Source identifier: ofr4911}
}