Signal Training. Volume II. Part I. Electricity and Magnetism. - Engeland Voorschrift Signal Training. Pamphlet no. 7. Training. Part VII. Royal Signals Courses. 1945 - Engeland Voorschrift Signal Training. Pamphlet no.8. Signal Office Organization and Procedure. Part IV. Procedure for Teleprinter Operating. 1945 - Engeland Voorschrift
