@misc{indiciae7826e00b8a3b,
  title = {Defining models and measuring aggregate quality for gravel deposits of the Front Range Urban Corridor, Colorado},
  author = {David A. Lindsey and William H. Langer},
  year = {1999},
  url = {https://pubs.usgs.gov/publication/70207817},
  note = {Source identifier: 70207817}
}