OECD standard codes for the official testing of agricultural and forestry tractors: codes VI and VII and the amendments to codes I, II, III, IV as published in the 1988 edition (Paris : Organisation for Economic Co-operation and Development ; [Washington, D.C. : OECD Publications and Information Centre, distributor], 1991)
Previous ed. published under title: O.E.C.D. standard code for the official testing of agricultural tractors. 1970.