@misc{indiciae2c2f6e11e20b,
  title = {Digital representation of exposures of Precambrian bedrock in parts of Dickinson and Iron Counties, Michigan, and Florence and Marinette Counties, Wisconsin},
  author = {William F. Cannon and Ruth Schulte and Damon Bickerstaff},
  year = {2018},
  doi = {10.3133/ofr20181042},
  url = {https://pubs.usgs.gov/publication/ofr20181042},
  note = {Source identifier: ofr20181042}
}