@misc{indiciae59a08e57444b,
  title = {Nuclear emulsion experiments on sounding},
  author = {Fichtel, C. E. and Guss, D. E. and Kniffen, D. A.},
  year = {1965},
  url = {https://ntrs.nasa.gov/citations/19650018833},
  note = {Source identifier: 19650018833}
}