Classification
693 - Specific materials & purposes
62
690 - Buildings
28
620 - Engineering & allied operations
22
624 - Civil engineering
11
670 - Manufacturing
9
691 - Building materials
6
621 - Applied physics
4
531 - Classical mechanics; solid mechanics
3
628 - Sanitary & municipal engineering
2
006 - Special computer methods
1
578 - Natural history of organisms
1
650 - Management & auxiliary services
1