@misc{indiciae860ec1da779d,
  title = {Land use and land cover, 1972-73, Ajo, Arizona},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1979},
  doi = {10.3133/l39},
  url = {https://pubs.usgs.gov/publication/l39},
  note = {Source identifier: l39}
}