@misc{indiciaeecca716a0436,
  title = {Computer-assisted interpretation of geophysical well logs in a coal depositional environment, Illinois Basin, Kentucky},
  author = {Jeffrey J. Daniels and James H. Scott},
  year = {1980},
  doi = {10.3133/b1509},
  url = {https://pubs.usgs.gov/publication/b1509},
  note = {Source identifier: b1509}
}