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CIVIL DEFENCE SITE |
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| SN | Sites and buildings used in the coordination of the defence of the civilian population during times of war. Could also be used during times of national emergency. |
| CL |
MILITARY DEFENCE AND FORTIFICATION |
| BT | DEFENCE SITE |
| NT |
AIR RAID PRECAUTIONS SITE
AIR RAID SHELTER BUFFER DEPOT CIVIL DEFENCE BUILDING CIVIL DEFENCE TRAINING GROUND NUCLEAR BUNKER ROYAL OBSERVER CORPS SITE |
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