Promotion examinations (R.A.F.) "B," "C,"  "E" and "F," held on 4th, 5th, 6th and 7th February, 1930 : report with copies of the examination papers and examiners' remarks thereon /
Great Britain.Air Ministry,issuing body.
Great Britain.His Majesty's Stationery Office.
"22.0041.02.30".