Supplement no.3 to Army/Air Operations Pamphlet no.4. (Chapter 3). Carriage of Artillery. Equipment bij Air. Section 6, Q.F. 17 Ponder, Mark 1 Gun on Carriage … Handbook for the ordnance, Q.F.25-Pounder : Marks II and III on carriage, 25-Pounder Mark I and Mounting, S.P.25-Pounder C Mark I and Mounting, Valentine, 25-Pounder …