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Websites over onderwerpen die in geen van de andere categorieen horen

Alpine Fronts & Swiss Fortifications (CH) [DE]
Berliner Unterwelten [DE][EN]
Fliegerhorst Venlo Herongen
Forderverein Ehemaliger Fliegerhorst Venlo e.V. [DE]
Geheimprojecte (AT) [DE]
German Underground Hospital, Jersey (UK) [EN]
Luftnachrichten-Datenbank [DE]
Military Fortifications of the World [EN]
Military Ruins (Calicia, Spain) [EN][SP]
New Age Fortifications Magazine [CZ][EN]
Orford Ness (UK, vm. testgebied) [EN]
Roman Military Sites (UK) [EN] vermist sinds 18-07-2012
Subterranea Brittannica [EN]
Underground Stations on London's Underground [EN]