@misc{indiciae3387cd0b591e,
  title = {Ilmenite, magnetite, hematite, and copper in lavas of the Keweenawan series},
  author = {Henry Rowland Cornwall},
  year = {1951},
  doi = {10.2113/gsecongeo.46.1.51},
  url = {https://pubs.usgs.gov/publication/70221635},
  note = {Source identifier: 70221635}
}