@misc{indiciae07e021d4c744,
  title = {Columbus folio, Ohio},
  author = {G.D. Hubbard and C.S. Prosser and C.R. Stauffer and J. A. Bownocker and E.R. Cumings},
  year = {1915},
  doi = {10.3133/gf197},
  url = {https://pubs.usgs.gov/publication/gf197},
  note = {Source identifier: gf197}
}