@misc{indiciae6da6e41d4f6d,
  title = {Helium soil gas survey of a collapse feature on the Hualapai Indian Reservation, Arizona},
  author = {G.M. Reimer},
  year = {1985},
  doi = {10.3133/ofr85394},
  url = {https://pubs.usgs.gov/publication/ofr85394},
  note = {Source identifier: ofr85394}
}