@misc{indiciaeb13982f49e18,
  title = {Chapter J: Issues and challenges in the application of geostatistics and spatial-data analysis to the characterization of sand-and-gravel resources},
  author = {Daniel R. Hack},
  year = {2005},
  doi = {10.3133/b2209j},
  url = {https://pubs.usgs.gov/publication/b2209J},
  note = {Source identifier: b2209J}
}