Classification
621 - Applied physics
280
629 - Other branches of engineering
29
620 - Engineering & allied operations
17
536 - Heat
16
660 - Chemical engineering
15
530 - Physics
6
541 - Physical chemistry
5
624 - Civil engineering
5
670 - Manufacturing
4
658 - General management
3
690 - Buildings
3
003 - Systems
2
333 - Economics of land & energy
2
338 - Production
2
336 - Public finance
1
352 - General considerations of public administration
1
510 - Mathematics
1
531 - Classical mechanics; solid mechanics
1
543 - Analytical chemistry
1
571 - Physiology & related subjects
1
616 - Diseases
1
628 - Sanitary & municipal engineering
1