@misc{indiciae61b716cf441e,
  title = {A new luminoscope for field use},
  author = {E.A. Sergeev and V.P. Sokoloff},
  year = {1946},
  doi = {10.3133/ofr4821d},
  url = {https://pubs.usgs.gov/publication/ofr4821D},
  note = {Source identifier: ofr4821D}
}