@misc{indiciaee56c53162dad,
  title = {Geologic Map of the Big Spring Quadrangle, Carter County, Missouri},
  author = {David J. Weary and Robert C. McDowell},
  year = {2006},
  doi = {10.3133/i2804},
  url = {https://pubs.usgs.gov/publication/i2804},
  note = {Source identifier: i2804}
}