@misc{indiciae27c2a4c9e7f3,
  title = {Visualizing the United States in computer chiaroscuro},
  author = {Richard J. Pike and Gail Thelin},
  year = {1992},
  doi = {10.1111/j.1467-8306.1992.tb01910.x},
  url = {https://pubs.usgs.gov/publication/70243292},
  note = {Source identifier: 70243292}
}