@misc{indiciaedcc2255aa75c,
  title = {Seismic refraction survey of an alluvial aquifer within Rapid City,·South Dakota, using a shotgun as an energy source},
  author = {E.A. Greene},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/70186629},
  note = {Source identifier: 70186629}
}