@misc{indiciaeafa468ba56f2,
  title = {Geologic and structure maps of the Wallace 1 degree by 2 degrees quadrangle, Montana and Idaho: A digital database},
  author = {Jack E. Harrison and Allan B. Griggs and John D. Wells},
  year = {1986},
  doi = {10.3133/i1509a},
  url = {https://pubs.usgs.gov/publication/i1509A},
  note = {Source identifier: i1509A}
}