FM 24-13. War Dept. Basic Field Manual - Air Extract Of Combined Operating Signals (CCBP 2-2), 2nd edition, Feb. 1944.
P/b, spiral bound, 15 x 12cm. 96p. One of these was issued to each airborne radio operator and one to each aeroplane equipped with radio gear. Lists all the signals/codes used for radio transmissions eg. signal QYQ 'Repeat all enemy reports on 385 kc/s (or on ..... kc/s) followed by homing transmission.' Quite an interesting little book. Creased front cover, otherwise good. Stock code P14417.