@misc{indiciae5f1aa5f0278f,
  title = {Digital data for construction material sources reported by the Arizona Department of Transportation in 1977 for Maricopa County, Arizona},
  author = {Douglas M. Hirschberg and G. Stephen Pitts and Henry L. Melcher and James D. Bliss},
  year = {2001},
  doi = {10.3133/ofr01122},
  url = {https://pubs.usgs.gov/publication/ofr01122},
  note = {Source identifier: ofr01122}
}