@misc{indiciaea926b0a974ab,
  title = {Map showing approximate top of Jacobsville sandstone, an erosion surface, in parts of Rockland and Greenland quadrangles, Ontonagon County, Michigan},
  author = {Jesse W. Whitlow},
  year = {1970},
  doi = {10.3133/ofr71324},
  url = {https://pubs.usgs.gov/publication/ofr71324},
  note = {Source identifier: ofr71324}
}