@misc{indiciaed98c5bf5cb0d,
  title = {Plant microfossils of the Hazard No. 7 coal, Perry County, Kentucky},
  author = {Robert M. Kosanke},
  year = {1965},
  doi = {10.3133/ofr6589},
  url = {https://pubs.usgs.gov/publication/ofr6589},
  note = {Source identifier: ofr6589}
}