Instrument Drill for Equipment Radar A.A. [ Anti-Aircraft] , no. 1, Mark 2. - Engeland Voorschrift 26/GS Publications/1362 WO 7397 Instrument Drill for Telescope Identification, A.A. [ Anti-Aircraft] - Engeland Voorschrift 26/GS Publications/1207 WO 7392 Instrument Drill for Predictors, A.A. [ Anti-Aircraft], nos.2 and 5 - Engeland Voorschrift 26/GS Publications/1177 WO 7394