Gun drill for Q.F. 3.7-inch Mark I Howitzer, on Marks I to IIIr carriages 1941 - Engeland Voorschrift 26/GS Publications/653 WO 7343 Supplement no.3 to Army/Air Operations Pamphlet no.4. (chapter 3). Carriage of Artillery. Equipment by air. Section 3, Q.F. 3.7 Howitzer, Mark 1 on carriages 3-7 … Gun Drill for Q.F. 3.7-inch Mark I, Howitzer on Carriage 3.7 inch, Mark 2P - Engeland Voorschrift 26/GS Publications/1467 WO 7981
