@misc{indiciaedcf9888aeba0,
  title = {Geology of Precambrian rocks, Ironwood-Ramsay area, Michigan},
  author = {Robert George Schmidt},
  year = {1972},
  doi = {10.3133/ofr72331},
  url = {https://pubs.usgs.gov/publication/ofr72331},
  note = {Source identifier: ofr72331}
}