Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Fortification_by_period> . }
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- German_World_War_II_strongholds subject Category:Fortification_by_period.
- Category:Cold_War_fortifications broader Category:Fortification_by_period.
- Category:Crusader_castles broader Category:Fortification_by_period.
- Category:Dacian_fortresses broader Category:Fortification_by_period.
- Category:Fortifications_of_Switzerland_in_the_20th_century broader Category:Fortification_by_period.
- Category:Fortifications_of_the_Spanish_Civil_War broader Category:Fortification_by_period.
- Category:Forts_in_England_by_period broader Category:Fortification_by_period.
- Category:Medieval_defences broader Category:Fortification_by_period.
- Category:Ottoman_fortifications broader Category:Fortification_by_period.
- Category:Roman_fortifications broader Category:Fortification_by_period.
- Category:World_War_II_defensive_lines broader Category:Fortification_by_period.
- Category:World_War_I_defensive_lines broader Category:Fortification_by_period.