Classification
670 - Manufacturing
981
620 - Engineering & allied operations
262
658 - General management
213
621 - Applied physics
207
006 - Special computer methods
190
629 - Other branches of engineering
115
660 - Chemical engineering
90
003 - Systems
75
519 - Probabilities & applied mathematics
32
333 - Economics of land & energy
24
004 - Data processing & computer science
23
304 - Factors affecting social behavior
21
005 - Computer programming, programs & data
20
650 - Management & auxiliary services
17
338 - Production
15
330 - Economics
14
628 - Sanitary & municipal engineering
13
690 - Buildings
13
363 - Other social problems & services
12
530 - Physics
11
610 - Medicine & health
10
641 - Food & drink
9
664 - Food technology
9
745 - Decorative arts
8
515 - Analysis
7
300 - Social sciences
6
600 - Technology
6
624 - Civil engineering
6
500 - Natural sciences & mathematics
5
551 - Geology, hydrology & meteorology
5
577 - Ecology
5
000 - Computer science, information & general works
4
370 - Education
4
616 - Diseases
4
667 - Cleaning, color & coating technologies
4
302 - Social interaction
3
531 - Classical mechanics; solid mechanics
3
541 - Physical chemistry
3
547 - Organic chemistry
3
570 - Life sciences; biology
3
720 - Architecture
3
140 - Specific philosophical schools
2
344 - Labor, social, education & cultural law
2
511 - General principles of mathematics
2
518 - Numerical analysis
2
537 - Electricity & electronics
2
613 - Personal health & safety
2
623 - Military & nautical engineering
2
691 - Building materials
2
900 - History & geography
2
more ...