@misc{indiciaedf7013703fb0,
  title = {Geology and coal resources of the Tiptop quadrangle, Kentucky},
  author = {Stewart W. Welch},
  year = {1958},
  doi = {10.3133/b1042p},
  url = {https://pubs.usgs.gov/publication/b1042P},
  note = {Source identifier: b1042P}
}