@misc{indiciae6628b4cb5426,
  title = {Preliminary geologic map of the Pleasant quadrangle, North Dakota},
  author = {Richard W. Lemke and Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey and J. Hiram Smith},
  year = {1947},
  doi = {10.3133/ofr4711},
  url = {https://pubs.usgs.gov/publication/ofr4711},
  note = {Source identifier: ofr4711}
}