Papers relating to the design and manufacture of tanks, 1915-1918, (fols. 1-41) memoranda and press cuttings on R.F. Macfie's tank designs, Nov.-Dec. 1916, with (fols. 31-41) correspondence concerning the tank service and the bus service, Mar.-May 1917; (fols. 42-249) papers, 1915-1917, on the development and use of tanks, including (fols. 151-154) discussion of Churchill's memorandum on mechanical warfare, 7 Nov. 1916; and (fols. 250-422) Department of Munitions Requirements and Statistics…