@misc{indiciae7c1e06c80368,
  title = {An Introduction to Using Surface Geophysics to Characterize Sand and Gravel Deposits},
  author = {Jeffrey E. Lucius and William H. Langer and Karl J. Ellefsen},
  year = {2006},
  doi = {10.3133/ofr20061257},
  url = {https://pubs.usgs.gov/publication/ofr20061257},
  note = {Source identifier: ofr20061257}
}