@misc{indiciae4cbb1da7757a,
  title = {Geology based planning and the aggregate industry -Perspectives from opposite sides of the globe},
  author = {A.W. Stephens and W. H. Langer},
  year = {2005},
  url = {https://pubs.usgs.gov/publication/70027579},
  note = {Source identifier: 70027579}
}