82:
77:
32:
52:
71:
56:
36:
20:
This category has the following 2 subcategories, out of 2 total.
83:
Pipelines in the United States by state or territory
78:
Transportation buildings and structures in
Oklahoma
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22:
14:
33:Natural gas pipelines in Oklahoma
1:
99:
53:Oil pipelines in Oklahoma
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17:Subcategories
16:
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72:Categories
57:(5 P)
37:(4 P)
74::
55:
35:
46:O
26:N
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