@misc{indiciaea1f752ef45e7,
  title = {Digital bedrock geologic map of the Ashland and northern part of the Ironwood 30' X 60' quadrangles, Wisconsin, and Michigan},
  author = {W.F. Cannon and L. G. Woodruff and S. W. Nicholson and C. A. Hedgman and R. Barber-Delach},
  year = {1999},
  doi = {10.3133/ofr99546},
  url = {https://pubs.usgs.gov/publication/ofr99546},
  note = {Source identifier: ofr99546}
}