@misc{indiciaeb9a195fdddb4,
  title = {Geologic information for aggregate resource planning},
  author = {William H. Langer and David A. Lindsey and Daniel H. Knepper},
  year = {2002},
  doi = {10.1007/978-94-010-0303-2\_7},
  url = {https://pubs.usgs.gov/publication/70217738},
  note = {Source identifier: 70217738}
}