@misc{indiciae6e2ee6cd50c2,
  title = {Seismic refraction survey in the Great Miami River Valley and vicinity, Montgomery, Warren, and Butler Counties, Ohio},
  author = {Joel S. Watkins and Andrew M. Spieker},
  year = {1964},
  doi = {10.3133/ofr64161},
  url = {https://pubs.usgs.gov/publication/ofr64161},
  note = {Source identifier: ofr64161}
}