Signal training. Vol. II : Line telephony and telegraphy - Engeland Voorschrift, 26/Manuals/1578 military training pamphlet Mines and booby traps : The breaching of minefields - Engeland Voorschrift, 26/GS Publications/982 military training pamphlet Mines and booby traps : How to deal with individual mechanisms - Engeland Voorschrift, 26/GS Publications/981 military training pamphlet Mines and booby traps : Laying and recording of British mines - Engeland Voorschrift, 26/GS Publications/1167 military training pamphlet Mines and booby traps : Enemy methods of minelaying (illustrated) - Engeland 26/GS Publications/1344 Line telegraphy and telephony (lines) - Engeland Voorschrift, 40/W.O./7320