@misc{indiciae8321c20ed267,
  title = {Guide to Korean stratigraphic nomenclature},
  author = {David Gallagher},
  year = {1968},
  doi = {10.3133/ofr6998},
  url = {https://pubs.usgs.gov/publication/ofr6998},
  note = {Source identifier: ofr6998}
}