Fortress Europe: From Stone to Steel Fortifications,1850–1945

Fortress America: The Forts That Defended America, 1600 to the Present

Castle to Fortress: Medieval to Post-Modern Fortifications in the Lands of the Former Roman Empire

Castrum to Castle: Classical to Medieval Fortifications in the Lands of the Western Roman Empire

The American GI in Europe in World War II: The March to D-Day

The Forts & Fortifications of Europe 1815-1945: The Central States: Germany, Austria-Hungry and Czechoslovakia

The American GI in Europe in World War II The Battle in France

The American GI in Europe in World War II: D-Day: Storming Ashore: Volume 3

The Forts & Fortifications of Europe 1815- 1945: The Neutral States: The Netherlands, Belgium and Switzerland

Verdun 1916: The Renaissance of the Fortress

The Atlantic Wall: History and Guide

Modern European Military Fortifications, 1870-1950: A Selective Annotated Bibliography

The Maginot Line: History and Guide