@misc{indiciaedafa12519526,
  title = {Chemical analyses and C.I.P.W. norms of nineteen volcanic rocks of the Ironwood area, Michigan},
  author = {Howard Arthur Hubbard},
  year = {1975},
  doi = {10.3133/ofr75145},
  url = {https://pubs.usgs.gov/publication/ofr75145},
  note = {Source identifier: ofr75145}
}