@misc{indiciaeaa12af90fa93,
  title = {Map of irrigated land in the Tucson area, Arizona},
  author = {U.S. Department of Agriculture and Arizona Water Commission},
  year = {1973},
  doi = {10.3133/i844b},
  url = {https://pubs.usgs.gov/publication/i844B},
  note = {Source identifier: i844B}
}