Machine Gun Handbook. (Technical). Volume I, Pamphlet no. 1. Vickers.303 inch and 5 inch Machine Guns and Appurtenances. WO 888 - Engeland Voorschrift 26/Publications/3431 Advanced Gas Training, 1943 Handbook of the Gun, Machine, Polsten, 20 mm. MK. I. WO 808 - Engeland Voorschrift 26/Manuals/3351 Directions for the use of Anti-Aircraft Artillery Instruments Drill. Pamphlet no. 7. Predictor. 3.7 inch A.A. no. 2, Mark I; 3 inch, 20 CWT. A.A. …