Classification
005 - Computer programming, programs & data
513
006 - Special computer methods
414
658 - General management
314
000 - Computer science, information & general works
246
330 - Economics
225
500 - Natural sciences & mathematics
139
620 - Engineering & allied operations
127
004 - Data processing & computer science
118
621 - Applied physics
103
700 - The arts; fine & decorative arts
103
600 - Technology
99
519 - Probabilities & applied mathematics
79
300 - Social sciences
74
333 - Economics of land & energy
64
610 - Medicine & health
57
001 - Knowledge
54
338 - Production
52
380 - Commerce, communications & transportation
44
900 - History & geography
38
331 - Labor economics
37
320 - Political science
34
153 - Mental processes & intelligence
33
140 - Specific philosophical schools
32
381 - Commerce
32
363 - Other social problems & services
29
302 - Social interaction
26
670 - Manufacturing
26
745 - Decorative arts
25
384 - Communications; telecommunication
19
530 - Physics
18
570 - Life sciences; biology
18
370 - Education
17
551 - Geology, hydrology & meteorology
17
576 - Genetics & evolution
17
003 - Systems
16
910 - Geography & travel
16
720 - Architecture
15
304 - Factors affecting social behavior
14
510 - Mathematics
14
580 - Plants (Botany)
14
629 - Other branches of engineering
14
170 - Ethics
13
332 - Financial economics
13
340 - Law
13
400 - Language
13
630 - Agriculture & related technologies
13
100 - Philosophy & psychology
12
301 - Sociology & anthropology
11
303 - Social processes
11
657 - Accounting
10
more ...