@misc{indiciaec72b42c985e3,
  title = {Preliminary surficial geologic map of the Mesabi-Vermilion Iron Range area, northeastern Minnesota},
  author = {R. D. Cotter and H. L. Young and T. C. Winter},
  year = {1964},
  doi = {10.3133/i403},
  url = {https://pubs.usgs.gov/publication/i403},
  note = {Source identifier: i403}
}