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ลำดับที่	LC	คำอธิบาย
1		Transportation and communications
2		Railroads. Rapid transit systems
3		Freight (General)
4		Passenger traffic (General)
5		Urban transportation
6		Transportation geography. Trade routes
7		Traffic engineering. Roads and highways. Streets
8		Traffic surveys (General)
9		Bridges
10		Tunnels. Vehicular tunnels
11		Waterways
12		Water transportation
13		Automotive transportation Including trucking, bus lines, and taxicab service
14		Shipping
15		Stage lines
16		Ferries
17		Express service
18		Postal service. Stamps. Philately
19		Merchant marine. Ocean shipping. Coastwise shipping
20		Pneumatic service
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