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Osprey - Fortress Publishing - 1 (February 2003) - Japanese Pacific Island Defenses 1941–45 | Osprey - Fortress Publishing - 2 (February 2003) - Hadrian’s Wall AD 122–410 | |
 
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Osprey - Fortress Publishing - 3 (February 2003) - U-Boat Bases and Bunkers 1941–45 | 
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Osprey - Fortress Publishing - 4 (February 2003) - American Defenses of Corregidor and Manila Bay 1898–1945 |
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Osprey - Fortress Publishing - 5 (April 2003) - Japanese Castles 1540–1640 | 
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Osprey - Fortress Publishing - 6 (April 2003) - American Civil War Fortifications (1) |
| Osprey - Fortress Publishing - 7 (June 2003) - The Lines of Torres Vedras 1809–11 | Osprey - Fortress Publishing - 8 (June 2003) - Defenses of Pearl Harbor and Oahu 1907–50 | ||
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Osprey - Fortress Publishing - 9 (August 2003) - English Civil War Fortifications 1642–51 | Osprey - Fortress Publishing - 10 (August 2003) - The Maginot Line 1928–45 | |
| Osprey - Fortress Publishing - 11 (October 2003) - Crusader Castles of the Teutonic Knights (1) | 
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Osprey - Fortress Publishing - 12 (November 2003) - Fortresses of the Peninsular War 1808–14 | |
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Osprey - Fortress Publishing - 13 (October 2003) - Norman Stone Castles (1) | 
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Osprey - Fortress Publishing - 14 (October 2003) - Fortifications in Wessex c. 800–1066 |
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Osprey - Fortress Publishing - 15 (January 2004) - Germany's West Wall | Osprey - Fortress Publishing - 16 (January 2004) - The Fortifications of Malta 1530–1945 | |
| Osprey - Fortress Publishing - 17 (January 2004) - Troy c. 1700–1250 BC | Osprey - Fortress Publishing - 18 (March 2004) - Norman Stone Castles (2) | ||
| Osprey - Fortress Publishing - 19 (May 2004) - Crusader Castles of the Teutonic Knights (2) | Osprey - Fortress Publishing - 20 (May 2004) - British Home Defences 1940–45 | ||
| Osprey - Fortress Publishing - 21 (July 2004) - Crusader Castles in the Holy Land 1097–1192 | 
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Osprey - Fortress Publishing - 22 (July 2004) - Mycenaean Citadels c. 1350–1200 BC | |
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Osprey - Fortress Publishing - 23 (August 2004) - German Field Fortifications 1939–45 | 
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Osprey - Fortress Publishing - 24 (September 2004) - Fortifications of the Western Front 1914–18 |
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Osprey - Fortress Publishing - 25 (October 2004) - The Walls of Constantinople AD 324–1453 | 
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Osprey - Fortress Publishing - 26 (October 2004) - Afghanistan Cave Complexes 1979–2004 |
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Osprey - Fortress Publishing - 27 (March 2005) - French Fortresses in North America 1535–1763 | 
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Osprey - Fortress Publishing - 28 (February 2005) - Forts of the American Frontier 1820–91 |
| Osprey - Fortress Publishing - 29 (April 2005) - US World War II and Korean War Field Fortifications 1941–53 | Osprey - Fortress Publishing - 30 (May 2005) - Fort Eben Emael | ||
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Osprey - Fortress Publishing - 31 (October 2005) - Rome’s Northern Frontier AD 70–235 | Osprey - Fortress Publishing - 32 (July 2005) - Crusader Castles in the Holy Land 1192–1302 |
Osprey - Fortress - 40 - Ancient Greek Fortifications 500 - 300 BC
Osprey - Fortress - 85 - Scapa Flow - The Defences Of Britain's Great Fleet Anchorage 1914 - 1945