@misc{indiciae2bf37c17e005,
  title = {Geology and mineral resources of the Cleveland district, Ohio},
  author = {Henry Platt Cushing and Frank Leverett and Frank Robertson. Van Horn},
  year = {1931},
  doi = {10.3133/b818},
  url = {https://pubs.usgs.gov/publication/b818},
  note = {Source identifier: b818}
}