Principles and Practice of Good Instruction for Officers and NCO Instructors. Part 1. WO 8162 - Engeland Voorschrift 26/GS Trg Publications/1637 Principles and Practice op for Officers Concerned with the Organization of Training. Good Instruction. - Engeland Voorschrift 26/GS. Trg Publications/1638 WO 8163 User Handbook for Centurion Mk. 3, W.O. Code No. 10538, 1953 - Engeland Voorschrift User Handbook for Centurion Mk. 3, W.O. Code No. 10538, 1953 - Engeland Voorschrift