Classification
621 - Applied physics
348
333 - Economics of land & energy
102
338 - Production
79
620 - Engineering & allied operations
48
660 - Chemical engineering
29
624 - Civil engineering
16
658 - General management
16
600 - Technology
13
629 - Other branches of engineering
13
720 - Architecture
11
700 - The arts; fine & decorative arts
10
330 - Economics
8
363 - Other social problems & services
8
577 - Ecology
7
579 - Microorganisms, fungi & algae
7
551 - Geology, hydrology & meteorology
6
000 - Computer science, information & general works
5
380 - Commerce, communications & transportation
5
519 - Probabilities & applied mathematics
5
531 - Classical mechanics; solid mechanics
5
628 - Sanitary & municipal engineering
5
670 - Manufacturing
5
690 - Buildings
5
900 - History & geography
5
320 - Political science
4
541 - Physical chemistry
4
580 - Plants (Botany)
4
004 - Data processing & computer science
3
174 - Occupational ethics
3
388 - Transportation; ground transportation
3
553 - Economic geology
3
650 - Management & auxiliary services
3
005 - Computer programming, programs & data
2
500 - Natural sciences & mathematics
2
530 - Physics
2
536 - Heat
2
539 - Modern physics
2
546 - Inorganic chemistry
2
550 - Earth sciences
2
570 - Life sciences; biology
2
627 - Hydraulic engineering
2
630 - Agriculture & related technologies
2
710 - Civic & landscape art
2
006 - Special computer methods
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
327 - International relations
1
340 - Law
1
361 - Social problems & social welfare in general
1
more ...