2173A Vol.I and VI, Aircooled gasoline engines for ground equipment; Section 1: General information, 2: Coventry-Victor engines, 3: Douglas engines, 4: Enfield engines, 5: J.A.P. … 2173A Vol.II Part.4, Air-cooled petrol engines for ground equipment; Section 1: General information, 2: Coventry-Victor engines, 3: Douglas engines, 4: Enfield engines, 5: J.A.P. engines, … 2173B Vol.I and VI, Water-cooled gasoline engines for ground equipment; Section: 1 General information, 2: Bradford engines, 3: Coventry-Climax engines, 4: Ford engines, 5: Fowler …