@misc{indiciae156bf2749a62,
  title = {Computer-aided estimates of concentrating-grade iron resources in the Negaunee Iron-formation, Marquette District, Michigan},
  author = {William F. Cannon and Sandra L. Powers and Nancy A. Wright},
  year = {1978},
  doi = {10.3133/pp1045},
  url = {https://pubs.usgs.gov/publication/pp1045},
  note = {Source identifier: pp1045}
}