@misc{indiciaedac5a6acbf62,
  title = {Transcontinental geophysical survey (35°-39° N): Bouguer gravity map from 100° to 112° W longitude},
  author = {the U.S. Air Force Aeronautical Chart and Information Center},
  year = {1968},
  doi = {10.3133/i533b},
  url = {https://pubs.usgs.gov/publication/i533B},
  note = {Source identifier: i533B}
}