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CLC U21 Railway Line Engineering
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Chinese Library Classification
A Marxism, Leninism, Mao Zedong Thought and Deng Xiaoping Theory
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B Philosophy, Religion
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C General Social Sciences
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D Politics, Law
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E Military
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F Economics
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G Culture, Science, Education, Sports
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H Language, Writing
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I Literature
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J Art
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K History and Geography
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N General Natural Sciences
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O Mathematical Sciences and Chemistry
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P Astronomy and Earth Sciences
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Q Biological Sciences
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R Medicine, Health
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S Agricultural Sciences
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T Industrial Technology
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U Transportation
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V Aviation and Aerospace
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X Environmental Science, Safety Science
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Z General Books
U-* general theory of transportation
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U-40
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U-49
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U-9 transport economy
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U1 Comprehensive Transportation
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U2 Railway Transportation
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U4 Road Transport
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U6 Waterway Transportation
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U8 Aviation Transportation
U2-09
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U2-092
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U2-28
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U2-40
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U2-43
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U2-61
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U2-65
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U2-9 railway transportation economy
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U21 Railway Line Engineering
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U22 Electrified Railway
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U23 Specialized Railway
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U24 Railway Bridge and Culvert Engineering
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U25 Railway Tunnel Engineering
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U26 Locomotive Engineering
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U27 Vehicle Engineering
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U28 Railway Communication and Signaling
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U29 Railway Transportation Management Engineering
U212
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U213
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U214
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U215
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U216
Subcategories
This category has the following 6 subcategories, out of 6 total.
CLC U212
(8 C)
CLC U213
(5 C)
CLC U214
(5 C)
CLC U215
(2 C)
CLC U216
(4 C)
鐵
鐵路
(11 F)
