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ANTI INVASION DEFENCE SITE |
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| SN | Sites, buildings and structures associated with the defence of the British Isles against invasion from seaborne or airborne forces. |
| CL |
MILITARY DEFENCE AND FORTIFICATION |
| BT | DEFENCE SITE |
| NT |
ANTI BOAT LANDING OBSTACLE
ANTI LANDING OBSTACLE ANTI SUBMARINE DEFENCE ANTI TANK ISLAND ANTI TANK OBSTACLE AUXILIARY UNIT SITE BARBED WIRE ENTANGLEMENT BUNKER CENTRE OF RESISTANCE CHECKPOINT DEFENDED LOCALITY DEMOLITION CHARGE SITE FIELDWORK GUN EMPLACEMENT LYON LIGHT EMPLACEMENT PETROLEUM WARFARE SITE PILLBOX RAILBLOCK ROADBLOCK SPIGOT MORTAR EMPLACEMENT STOP LINE VULNERABLE DEFILE |
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