@misc{indiciaec82efa91aed6,
  title = {Structure contours on top of the Fall River sandstone, NW corner of the Flint Hill quadrangle, Fall River County, South Dakota, fig. 6},
  author = {Edwin Van Horn Post},
  year = {1955},
  doi = {10.3133/ofr55141},
  url = {https://pubs.usgs.gov/publication/ofr55141},
  note = {Source identifier: ofr55141}
}