@misc{indiciaebbaeae30c63f,
  title = {Map Showing Construction Materials and Nonmetallic Mineral Resources of North Dakota},
  author = {Andrew F. Shride and E.C. Fischer and D. M. Larrabee and and others},
  year = {1947},
  doi = {10.3133/mb14},
  url = {https://pubs.usgs.gov/publication/mb14},
  note = {Source identifier: mb14}
}