Classification
658 - General management
804
153 - Mental processes & intelligence
533
330 - Economics
526
000 - Computer science, information & general works
187
700 - The arts; fine & decorative arts
160
333 - Economics of land & energy
134
500 - Natural sciences & mathematics
133
600 - Technology
130
610 - Medicine & health
122
620 - Engineering & allied operations
120
300 - Social sciences
111
320 - Political science
95
900 - History & geography
89
363 - Other social problems & services
88
302 - Social interaction
86
380 - Commerce, communications & transportation
84
670 - Manufacturing
81
650 - Management & auxiliary services
64
332 - Financial economics
63
338 - Production
60
140 - Specific philosophical schools
57
519 - Probabilities & applied mathematics
54
331 - Labor economics
50
340 - Law
48
370 - Education
46
100 - Philosophy & psychology
39
158 - Applied psychology
38
006 - Special computer methods
37
170 - Ethics
37
576 - Genetics & evolution
36
551 - Geology, hydrology & meteorology
35
580 - Plants (Botany)
31
005 - Computer programming, programs & data
25
384 - Communications; telecommunication
23
630 - Agriculture & related technologies
22
570 - Life sciences; biology
19
381 - Commerce
18
720 - Architecture
17
001 - Knowledge
15
304 - Factors affecting social behavior
14
410 - Linguistics
13
361 - Social problems & social welfare in general
10
581 - Specific topics in natural history
10
150 - Psychology
9
339 - Macroeconomics & related topics
9
368 - Insurance
9
540 - Chemistry & allied sciences
9
657 - Accounting
9
004 - Data processing & computer science
8
336 - Public finance
8
more ...