@misc{indiciaee947e43d7600,
  title = {Topographic Change Detection at Select Archeological Sites in Grand Canyon National Park, Arizona, 2006-2007},
  author = {Brian D. Collins and Diane L. Minasian and Robert Kayen},
  year = {2009},
  doi = {10.3133/sir20095116},
  url = {https://pubs.usgs.gov/publication/sir20095116},
  note = {Source identifier: sir20095116}
}