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ลำดับที่LC 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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