@misc{indiciae2ce11225855c,
  title = {High-resolution surface-seismic imaging techniques for NEHRP soil profile classifications and earthquake hazard assessments in urban areas},
  author = {Robert A. Williams and William J. Stephenson and Jack K. Odum and David M. Worley},
  year = {1997},
  doi = {10.3133/ofr97501},
  url = {https://pubs.usgs.gov/publication/ofr97501},
  note = {Source identifier: ofr97501}
}