@misc{indiciaee92b67247588,
  title = {Subsurface cross sections of pre-Pennsylvanian rocks from Morton County, Kansas, to Gray County, Texas},
  author = {J.B. Collins},
  year = {1952},
  doi = {10.3133/oc47},
  url = {https://pubs.usgs.gov/publication/oc47},
  note = {Source identifier: oc47}
}