@misc{indiciae15105f456056,
  title = {Geophysical expression of a buried niobium and rare earth element deposit: the Elk Creek carbonatite, Nebraska, USA},
  author = {Benjamin J. Drenth},
  year = {2014},
  doi = {10.1190/int-2014-0002.1},
  url = {https://pubs.usgs.gov/publication/70124942},
  note = {Source identifier: 70124942}
}