@misc{indiciae834da98c40f2,
  title = {Generalized fence diagram showing principal coal and key marine beds of Pennsylvanian age in the Hazard 30' x 60' quadrangle, eastern Kentucky},
  author = {J. W. Kradyna and C. L. Rice},
  year = {1986},
  doi = {10.3133/i1727b},
  url = {https://pubs.usgs.gov/publication/i1727B},
  note = {Source identifier: i1727B}
}