Directions for the use of artillerie instruments Pamphlet no.9. Recorder, Sound Ranging, no.1, Marks II, III, and IV. WO 7337 Directions for the use of artillery instrument. Pamphlet no.13. Carrier Link, Sound Ranging. WO 7341 Directions for the use of artillery instrument. Pamphlet no.14. Sound Ranging Equipment, Misellaneous, WO 7034
