@misc{indiciae3afd6517314a,
  title = {Experimental digital shaded-relief maps of Oregon digital shaded relief with color-coded elevations},
  author = {Kathleen Edwards and R. M. Batson},
  year = {1992},
  doi = {10.3133/i2271},
  url = {https://pubs.usgs.gov/publication/i2271},
  note = {Source identifier: i2271}
}