Classification
620 - Engineering & allied operations
005 - Computer programming, programs & data
744
500 - Natural sciences & mathematics
661
745 - Decorative arts
163
331 - Labor economics
146
384 - Communications; telecommunication
108
658 - General management
101
621 - Applied physics
90
006 - Special computer methods
83
629 - Other branches of engineering
69
600 - Technology
63
004 - Data processing & computer science
60
000 - Computer science, information & general works
59
330 - Economics
39
900 - History & geography
22
302 - Social interaction
21
333 - Economics of land & energy
19
374 - Adult education
18
700 - The arts; fine & decorative arts
17
770 - Photography, photographs & computer art
17
794 - Indoor games of skill
15
790 - Recreational & performing arts
14
363 - Other social problems & services
13
380 - Commerce, communications & transportation
11
630 - Agriculture & related technologies
11
510 - Mathematics
10
519 - Probabilities & applied mathematics
9
300 - Social sciences
8
332 - Financial economics
7
320 - Political science
6
720 - Architecture
6
140 - Specific philosophical schools
5
153 - Mental processes & intelligence
5
338 - Production
5
381 - Commerce
5
670 - Manufacturing
5
370 - Education
4
540 - Chemistry & allied sciences
4
518 - Numerical analysis
3
610 - Medicine & health
3
650 - Management & auxiliary services
3
910 - Geography & travel
3
001 - Knowledge
2
003 - Systems
2
025 - Library operations
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
628 - Sanitary & municipal engineering
2
660 - Chemical engineering
2
more ...