@misc{indiciae1ed6d395d930,
  title = {A system of regional agricultural land use mapping tested against small scale Apollo 9 color infrared photography of the Imperial Valley (California)},
  author = {Claude W. Johnson and Leonard W. Browden and Robert W. Pease},
  year = {1969},
  doi = {10.3133/ofr71158},
  url = {https://pubs.usgs.gov/publication/ofr71158},
  note = {Source identifier: ofr71158}
}