en
Castrum to Castle - Classical to Medieval Fortifications in the Lands of the Western Roman Empire
H. W. Kaufmann, J. E. Kaufmann
en
Verdun 1916 - The Renaissance of the Fortress
H. W. Kaufmann, J. E. Kaufmann
en
The Forts & Fortifications of Europe 1815- 1945: The Neutral States - The Netherlands Belgium and Switzerland
H. W. Kaufmann, J. E. Kaufmann
en
The Forts & Fortifications of Europe 1815-1945: The Central States - Germany Austria-Hungry and Czechoslovakia
H. W. Kaufmann, J. E. Kaufmann
en
The Atlantic Wall - History and Guide
H. W. Kaufmann, J. E. Kaufmann, A. Jankovic-Potocnik, Vladimir Tonic
en
The Maginot Line - History and Guide
H. W. Kaufmann, J. E. Kaufmann, Aleksander Potocnik, Patrice Lange
