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This category has the following 10 subcategories, out of 10 total.
8:
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273:Buildings and structures by period
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238:World War II defensive lines
221:World War I defensive lines
289:
268:Military history by period
125:Forts in England by period
36:Fortifications by century
197:Sassanian fortifications
60:Cold War fortifications
173:Roman fortifications
149:Medieval defences
101:Dacian fortresses
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17:Subcategories
16:
153:(13 C, 26 P)
19:
242:(8 C, 62 P)
177:(5 C, 14 P)
81:(7 C, 59 P)
257:Categories
225:(2 C, 4 P)
201:(2 C, 8 P)
105:(1 C, 3 P)
64:(8 C, 6 P)
40:(22 C)
129:(8 C)
259::
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79:
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210:W
186:S
162:R
138:M
114:F
90:D
49:C
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