@misc{indiciae1a2c0a4579c6,
  title = {Structure contours on top of the Fall River sandstone, NE corner of the Edgemont quadrangle, Fall River County, South Dakota, fig. 9},
  author = {John Donald Ryan},
  year = {1955},
  doi = {10.3133/ofr55155},
  url = {https://pubs.usgs.gov/publication/ofr55155},
  note = {Source identifier: ofr55155}
}