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ลำดับที่	LC	คำอธิบาย
41		Surveying
42		Structural engineering (General)
43		Engineering geology. Rock mechanics. Soil mechanics. Underground construction
44		Earthwork. Foundations
45		Tunneling. Tunnels
46		Hydraulic engineering
47		Ocean engineering
48		Technical hydraulics
49		General preliminary operations. Dredging. Submarine building
50		Harbors and coast protective works. Coastal engineering. Lighthouses
51		River, lake, and water-supply engineering (General)
52		River protective works. Regulation. Flood control
53		Dams. Barrages
54		Canals and inland navigation. Waterways
55		Irrigation engineering. Reclamation of wasteland. Drainage
56		Environmental technology. Sanitary engineering
57		Hazardous substances and their disposal
58		Municipal engineering
59		Environmental protection
60		Environmental pollution
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