Classification
658 - General management
93
690 - Buildings
36
352 - General considerations of public administration
34
624 - Civil engineering
22
621 - Applied physics
20
330 - Economics
17
670 - Manufacturing
15
333 - Economics of land & energy
13
600 - Technology
10
620 - Engineering & allied operations
9
900 - History & geography
8
000 - Computer science, information & general works
7
720 - Architecture
7
700 - The arts; fine & decorative arts
6
363 - Other social problems & services
5
691 - Building materials
5
610 - Medicine & health
4
696 - Utilities
4
400 - Language
3
500 - Natural sciences & mathematics
3
650 - Management & auxiliary services
3
660 - Chemical engineering
3
004 - Data processing & computer science
2
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
320 - Political science
2
331 - Labor economics
2
338 - Production
2
370 - Education
2
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
711 - Area planning
2
300 - Social sciences
1
302 - Social interaction
1
307 - Communities
1
332 - Financial economics
1
346 - Private law
1
355 - Military science
1
384 - Communications; telecommunication
1
410 - Linguistics
1
571 - Physiology & related subjects
1
580 - Plants (Botany)
1
628 - Sanitary & municipal engineering
1
629 - Other branches of engineering
1
697 - Heating, ventilating & air-conditioning
1
800 - Literature & rhetoric
1