@misc{indiciaefec716bd7d5c,
  title = {Quaternary geologic map of the Vicksburg 4° x 6° quadrangle, United States},
  author = {W. A. Gilliland and K. V. Luza and D. E. Pope and E. G. Wermund and R. A. Miller and W. V. Bush and K. N. Jensen and W. D. Fishman and David S. Fullerton and David L. Weide and Charles A. Bush},
  year = {1990},
  doi = {10.3133/i1420(ni15)},
  url = {https://pubs.usgs.gov/publication/i1420(NI15)},
  note = {Source identifier: i1420(NI15)}
}