E (Engineering) Papers on Mechanical Warfare Organisation including correspondence between Christopher Addison, Ministry of Munitions and Lord Derby, War Office, on memorandum by Lieutenant-Colonel A G Stern, Director General Mechanical Warfare Supply Department on the organisation of sections of Government departments dealing with tanks, and the tactical use of tanks in warfare; papers on the responsibility for the inspection of tanks; and on the organisation and responsibilities of the Department of Mechanical Warfare Supply.