@misc{indiciaebd89ecf63f03,
  title = {Structural contours and Phanerozoic structures in the Rapid City, South Dakota, 1:100,000 scale quadrangle},
  author = {J. A. Redden},
  year = {1994},
  doi = {10.3133/ofr9581},
  url = {https://pubs.usgs.gov/publication/ofr9581},
  note = {Source identifier: ofr9581}
}