@misc{indiciae2b6769c9b0be,
  title = {The subsurface stratigraphy and structure of the Simpson area, 1950},
  author = {T.G. Roberts and Florence Robinson},
  year = {1954},
  doi = {10.3133/ofr54257},
  url = {https://pubs.usgs.gov/publication/ofr54257},
  note = {Source identifier: ofr54257}
}