@misc{indiciae923dcac543ac,
  title = {Transient electromagnetic soundings near Great Sand Dunes National Park and Preserve, San Luis Valley, Colorado (2006 field season)},
  author = {David V. Fitterman and Oderson A. de Souza Filho},
  year = {2009},
  doi = {10.3133/ofr20091051},
  url = {https://pubs.usgs.gov/publication/ofr20091051},
  note = {Source identifier: ofr20091051}
}