@misc{indiciae86593e6b5664,
  title = {Map showing relative erodibility of geologic materials in the Parker quadrangle, Arapahoe and Douglas Counties, Colorado},
  author = {J. O. Maberry},
  year = {1972},
  doi = {10.3133/i770g},
  url = {https://pubs.usgs.gov/publication/i770G},
  note = {Source identifier: i770G}
}