@misc{indiciaee9c3ecb16aae,
  title = {A regional gravity survey of the Cuyuna Iron Range, Minnesota},
  author = {George Austin Durfee},
  year = {1957},
  doi = {10.3133/ofr5741},
  url = {https://pubs.usgs.gov/publication/ofr5741},
  note = {Source identifier: ofr5741}
}