@misc{indiciaeafcf36e0e4d3,
  title = {Specification aggregate quarry expansion - A case study demonstrating sustainable management of natural aggregate resources},
  author = {William H. Langer and M. L. Tucker},
  year = {2003},
  doi = {10.3133/ofr03121},
  url = {https://pubs.usgs.gov/publication/ofr03121},
  note = {Source identifier: ofr03121}
}