@misc{indiciae507762d530af,
  title = {Geology of the Knoxville and Delaware quadrangles, Johnson and Logan counties and vicinity, Arkansas},
  author = {E.A. Merewether},
  year = {1971},
  doi = {10.3133/pp657b},
  url = {https://pubs.usgs.gov/publication/pp657B},
  note = {Source identifier: pp657B}
}