Promotion examinations (R.A.F.) "B," "C,"  "E" and "F," held on 3rd, 4th, 5th and 6th March, 1931, with copies of the examination papers and examiners' remarks thereon /
Great Britain.Air Ministry,issuing body.
Great Britain.His Majesty's Stationery Office.
"22.41.3.31".