Pollard, Capt A O
Chronological Checklist
- The Cipher Five (London: Hutchinson and Co, 1932)
- The Murder Germ (London: Hutchinson and Co, 1937)
- Air Reprisal (London: Hutchinson and Co, 1938)
- The Secret Formula (London: Hutchinson and Co, 1939)
- The Secret Weapon (London: Hutchinson and Co, 1941)
- The Fifth Freedom (London: Hutchinson and Co, 1944)