@misc{indiciae25b4246c9307,
  title = {A Hammer-Impact, Aluminum, Shear-Wave Seismic Source},
  author = {Seth S. Haines},
  year = {2007},
  doi = {10.3133/ofr20071406},
  url = {https://pubs.usgs.gov/publication/ofr20071406},
  note = {Source identifier: ofr20071406}
}