@misc{indiciae15cc95eaa8b3,
  title = {Slide show on gravel deposit models and measuring aggregate quality, Front Range urban corridor, Colorado},
  author = {David A. Lindsey and William H. Langer},
  year = {1998},
  doi = {10.3133/ofr98332},
  url = {https://pubs.usgs.gov/publication/ofr98332},
  note = {Source identifier: ofr98332}
}