@misc{indiciaed5da955b2366,
  title = {Aeronautic Instruments. Section IV : Direction Instruments},
  author = {Franklin, W S and Stillman, M H and Sanford, R L and Warner, John A C and Sylvander, R C and Rounds, E W},
  year = {1923},
  url = {https://ntrs.nasa.gov/citations/19930091191},
  note = {Source identifier: 19930091191}
}