Handbook of Mine Detectors. Part III. The Polish Detector no 3 and Detector no. 3 A. WO 902 Military Training Pamphlet. no. 40. Mines and Booby Traps. Part I. (All Arms). How te deal with individual mechanisms Handbook of Mine Detectors. Part IV. The no. 4 Detector. WO 903 Handbook of Mine Detectors. Part V. The no. 5 A Detector. WO 904