@misc{indiciae73c29c261ba4,
  title = {Using geographic information systems with specific examples for the aggregate industry},
  author = {Roger Melik and T.L. Furman and W. H. Langer and H. Van Brenk},
  year = {1998},
  doi = {10.3133/ofr9839},
  url = {https://pubs.usgs.gov/publication/ofr9839},
  note = {Source identifier: ofr9839}
}