@misc{indiciae348f2a55780c,
  title = {An evaluation of several geophysical methods for characterizing sand and gravel deposits},
  author = {K.J. Ellefsen and J.E. Lucius and D.V. Fitterman},
  year = {1998},
  doi = {10.3133/ofr98221},
  url = {https://pubs.usgs.gov/publication/ofr98221},
  note = {Source identifier: ofr98221}
}