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This category has the following 7 subcategories, out of 7 total.
199:Transport buildings and structures in Oceania
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117:
100:
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32:
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56:Immersed tube tunnels in Oceania
1:
36:Tunnels in Oceania by country
169:Undersea tunnels in Oceania
80:Proposed tunnels in Oceania
215:
104:Railway tunnels in Oceania
121:Road tunnels in Oceania
194:Tunnels by continent
145:Tunnels in Hawaii
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17:Subcategories
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188:Categories
173:(1 C, 2 P)
149:(1 C)
125:(4 C)
108:(3 C)
84:(4 C)
60:(1 P)
40:(2 C)
190::
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158:U
134:T
93:R
69:P
49:I
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