@misc{indiciaee77c1c404428,
  title = {Preliminary geologic map of the Carpio quadrangle, North Dakota},
  author = {Richard W. Lemke and J. Hiram Smith},
  year = {1947},
  doi = {10.3133/ofr476},
  url = {https://pubs.usgs.gov/publication/ofr476},
  note = {Source identifier: ofr476}
}