@misc{indiciaeb9101f69204f,
  title = {Geology of Porcupine Mountains in Carp River and White Pine Quadrangles, Michigan},
  author = {Harold A. Hubbard},
  year = {1975},
  url = {https://pubs.usgs.gov/publication/70046166},
  note = {Source identifier: 70046166}
}