The Mannerheim Line 1920–39
Bair Irincheev
The Moscow Kremlin
Mark Galeotti
German Field Fortifications 1939–45
Gordon L. Rottman
Strongholds of the Border Reivers
Keith Durham
The Forts of Celtic Britain
Angus Konstam
Germany's East Wall in World War II
Neil Short
Norman Stone Castles (2)
Christopher Gravett
Defenses of Pearl Harbor and Oahu 1907–50
Glen Williford & Terrance McGovern
Japanese Castles in Korea 1592–98
Stephen Turnbull
The Atlantic Wall (2)
Steven J. Zaloga