- O Amigo Alemão
- O ato e o fato
- O Brasil na Primeira Guerra Mundial
- O Espírito do Guerreiro
- O Grande Livro das Coisas Horríveis
- O jovem Hitler
- O julgamento de Adolf Hitler
- O pacto do diabo
- O Século de Sangue
- O voluntário de Auschwitz
- OABR - Livro Histórico
- Observations of an Orderly
- Observers and Navigators
- Occhi di marrone
- Occupation and Insurgency
- Occupied Economies
- Occupying Force
- Ocean Ablaze
- Ocean Life in the Old Sailing-Ship Days
- October 1973 The Arab Israeli War
- Odessa 1941-44
- Odnaleźć siebie
- Odnaleźć siebie
- Of Islands, Ports and Sea Lanes
- Of Lessons Learned
- Of Living Valour
- Of Love And War
- Of Sea Stories and Fairy Tales
- Of Smiling Peace
- Off Target
- Off to Be a Soldier, With a Daily Letter to My Wife
- Off to Mt. (Mount) Hood
- Offensive Use of Chemical Technologies by U.S. Special Operations Forces in the Global War on Terror...
- Office of Naval Research Naval Science & Technology (S&T) Strategic Plan: Tomorrow's Technologies fo...
- Office of the Strategic Services Operational Groups in France During World War II, July-October 1944
- Official History Of The Otago Regiment In The Great War 1914-1918 [Illustrated Edition]
- Official History Of The Royal Air Force 1935-1945 — Vol. I — Fight At Odds [Illustrated Edition]
- Official History of the Royal Air Force 1935-1945 — Vol. II —Fight Avails [Illustrated Edition]
- Official History of the Royal Air Force 1935-1945 — Vol. III — The Fight Is Won [Illustrated Edition...
- Official U.S. Reports on North Korea: Military and Security Developments Involving the Democratic Pe...
- Official War History Of The Wellington Mounted Rifles Regiment 1914-1919 [Illustrated Edition]
- Offsetting Tomorrow's Adversary in a Contested Environment: Defending Expeditionary Advance Bases (E...
- Ogni viltà convien che qui sia morta
- Ohio at Antietam
- Ohio Warbird Survivors 2003
- Ohne Euch wäre ich aufgesessen
- Oil Logistics in the Pacific War in and After Pearl Harbor
- Okkupert
- Old and New Insurgency Forms
- Old Fort Snelling
- Old John Neptune and Other Maine Indian Shamans
- Old Memories (Of The Indian Mutiny 1857) [Illustrated Edition]
- Old Peninsula Days
- Old Sword Play
- Old World ... New World: From a picnic at La Perouse to the Western Front
- Olga
- Oligarquía en guerra
- Oliver Cromwell (Penguin Monarchs)
- Oliver Cromwell; Or, England's Great Protector
- Oltre il muro
- Oltre le fazioni: l'altra faccia di guelfi e ghibellini
- Olviretki Schleusingenissä, Leo ja Liina; Alma
- Olösta mysterier
- Om stenarna kunde tala