Air Defence Research Sub-Committee Papers (A.D.R. 130-146, 131, 145 missing) Note by the Air Ministry on High Altitude Balloon Research (A.D.R. 130) War Office summary of progress on the 3 inch U.P. [unrotated projectile] experimental work (A.D.R. 132) War Office note on the use of U.P. to create an aerial minefield (A.D.R. 133) War Office note on scheme for the formation of a separate U.P. establishment (A.D.R. 134) War Office note on the use of the 2 inch U.P. against low flying attack (A.D.R. 135) Note by the Chairman of the Supply Board on the supply of solventless cordite for U.P. purposes (A.D.R. 136) Note by Prof. F A Lindemann (later Lord Cherwell) on the use of U.P. to create an aerial minefield (A.D.R. 137) Air Ministry note on the use of U.P. to create an aerial minefield (A.D.R. 138) Air Ministry note on the use of the U.P. weapon for aircraft armament (A.D.R. 139) Conclusions of the 20th meeting of the Committee War Office note on establishment for Projectile Development (A.D.R. 140) Report by Dr Alwyn Crow on progress of 3 inch U.P. development (A.D.R. 141) War Office note on the use of the 2 inch U.P. against low flying attack (A.D.R. 142) Note on trials to determine the effective range of searchlights (A.D.R. 143) Observations by WSC on his visit to the Air Ministry Research Station at Martlesham and Bawdsey (A.D.R. 144) Note by the Director of Scientific Research, Air Ministry on the use of the aerial mine against airscrews (A.D.R. 146) Conclusions of the 21st meeting of the Committee.