Classification
620 - Engineering & allied operations
227
600 - Technology
151
004 - Data processing & computer science
132
700 - The arts; fine & decorative arts
125
333 - Economics of land & energy
117
900 - History & geography
102
658 - General management
97
000 - Computer science, information & general works
87
621 - Applied physics
86
005 - Computer programming, programs & data
69
610 - Medicine & health
55
330 - Economics
51
380 - Commerce, communications & transportation
42
363 - Other social problems & services
38
500 - Natural sciences & mathematics
38
580 - Plants (Botany)
26
006 - Special computer methods
24
140 - Specific philosophical schools
23
670 - Manufacturing
23
331 - Labor economics
22
530 - Physics
21
576 - Genetics & evolution
17
551 - Geology, hydrology & meteorology
16
629 - Other branches of engineering
16
519 - Probabilities & applied mathematics
14
370 - Education
13
745 - Decorative arts
13
414 - Phonology & phonetics
11
340 - Law
10
720 - Architecture
10
003 - Systems
9
320 - Political science
8
100 - Philosophy & psychology
7
304 - Factors affecting social behavior
7
624 - Civil engineering
7
641 - Food & drink
7
660 - Chemical engineering
7
664 - Food technology
7
690 - Buildings
7
800 - Literature & rhetoric
7
300 - Social sciences
6
338 - Production
6
628 - Sanitary & municipal engineering
6
170 - Ethics
5
510 - Mathematics
5
540 - Chemistry & allied sciences
5
630 - Agriculture & related technologies
5
612 - Human physiology
4
158 - Applied psychology
3
384 - Communications; telecommunication
3
more ...