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 Handbook of the Gun, Machine, Polsten, 20 mm. MK. I. WO 808 - Engeland Voorschrift 26/Manuals/3351 Supplement no.3 to Army/Air Operations, Pamphlet no.4. (Chapter 3). Carriage of Artillery Equipment by air. Section 8. Gun, Machine, Polsten 20 mm. Mark I on … Small Arms Training. Volume I, Pamphlet No. 21, Thompson Sub-Machine-Gun, 1940 - Engeland Voorschrift Small Arms Training. Volume I, Pamphlet No. 21, The Thomson Machine Carbine, 1942. - Engeland Voorschrift