@misc{indiciae51c63f12ba70,
  title = {Vegetation map of the Colorado Springs-Castle Rock area, Front Range Urban Corridor, Colorado},
  author = {J. W. Marr and D. G. Steward},
  year = {1979},
  doi = {10.3133/i857g},
  url = {https://pubs.usgs.gov/publication/i857G},
  note = {Source identifier: i857G}
}