Fortification

Annals of a Fortress

Eugène-Emmanuel Viollet-le-Duc

Fort Sumter: Anvil of War

United States. National Park Service

Uncle Wiggily's Auto Sled

Howard Roger Garis

Quaint and Historic Forts of North America

John Martin Hammond

La cité de Carcassonne

Eugène-Emmanuel Viollet-le-Duc

French

Fort Concho: Its Why and Wherefore

James N. Gregory, also an audiobook

Die Festungen gegenüber den gezogenen Geschützen

M. von Prittwitz

German