@misc{indiciaec1566f6e2f4a,
  title = {S-wave refraction survey of alluvial aggregate},
  author = {Karl J. Ellefsen and Gary J. Tuttle and Jackie M. Williams and Jeffrey E. Lucius},
  year = {2005},
  doi = {10.3133/sir20055012},
  url = {https://pubs.usgs.gov/publication/sir20055012},
  note = {Source identifier: sir20055012}
}