@misc{indiciae33a825ab0e18,
  title = {Pre-Pennsylvanian geology of southwestern Kansas, southeastern Colorado, and the Oklahoma Panhandle},
  author = {John Charles Maher and Jack B. Collins},
  year = {1949},
  doi = {10.3133/om101},
  url = {https://pubs.usgs.gov/publication/om101},
  note = {Source identifier: om101}
}