Signal Training. (All Arms) Pamphlet no. 5. Signal Procedure. Part 1. Procedure for Radio Telephony. 1943 - Engeland Voorschrift Signal Training. Volume II. Part I. Electricity and Magnetism. - Engeland Voorschrift Pamphlet no. 42. Combined Operations. Training at Home Stations. WO 7857 - Engeland Voorschrift 26/G.S. Publications/926 Signal Training. Vol. II. Part II. Wireless. 1936. - Engeland Voorschrift