@misc{indiciae4bb396cf7b16,
  title = {Geologic map of the Ontonagon and part of the Wakefield 30' X 60' quadrangles, Michigan; a digital representation of Map I-2499 (1995)},
  author = {W.F. Cannon and S. W. Nicholson and L. G. Woodruff and C. A. Hedgman and K.J. Schultz and S.G. Pimley},
  year = {2001},
  doi = {10.3133/ofr0188},
  url = {https://pubs.usgs.gov/publication/ofr0188},
  note = {Source identifier: ofr0188}
}