@misc{indiciae9f1caf1c9309,
  title = {A Simplified Chart for Determining Mach Number and True Airspeed from Airspeed-indicator Readings},
  author = {Ritchie, Virgil S},
  year = {1943},
  url = {https://ntrs.nasa.gov/citations/19930093483},
  note = {Source identifier: 19930093483}
}