@misc{indiciae676b92dc6bf6,
  title = {Third international conference on Ground penetrating radar; abstracts of the technical meeting},
  author = {G.R. Olhoeft and S.K. Duke},
  year = {1990},
  doi = {10.3133/ofr90414},
  url = {https://pubs.usgs.gov/publication/ofr90414},
  note = {Source identifier: ofr90414}
}