CITADELS (ARCHITECTURE)
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BTFORTS + FORTRESSES + FORTIFICATIONS + BUNKERS (ARCHITECTURE)
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UDC725.182,1
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Descriptor GERZITADELLEN (ARCHITEKTUR)
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Descriptor ENGCITADELS (ARCHITECTURE)
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Descriptor FRECITADELLES (ARCHITECTURE)
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RTFORTIFIED TOWNS + MILITARY BASES (URBAN PLANNING)