@misc{indiciae25e770e39e4b,
  title = {Structure and stratigraphy of the outcropping Pennsylvanian rocks in the Tiptop quadrangle, Breathitt, Magoffin and Knott Counties, Kentucky},
  author = {Stewart W. Welch},
  year = {1955},
  doi = {10.3133/om163},
  url = {https://pubs.usgs.gov/publication/om163},
  note = {Source identifier: om163}
}