Classification
330 - Economics
639
519 - Probabilities & applied mathematics
295
616 - Diseases
283
006 - Special computer methods
176
612 - Human physiology
126
658 - General management
126
610 - Medicine & health
124
300 - Social sciences
113
570 - Life sciences; biology
110
571 - Physiology & related subjects
109
530 - Physics
89
005 - Computer programming, programs & data
87
510 - Mathematics
77
333 - Economics of land & energy
76
500 - Natural sciences & mathematics
63
620 - Engineering & allied operations
58
572 - Biochemistry
57
576 - Genetics & evolution
54
000 - Computer science, information & general works
52
700 - The arts; fine & decorative arts
50
338 - Production
48
332 - Financial economics
46
501 - Philosophy & theory
45
621 - Applied physics
43
001 - Knowledge
42
004 - Data processing & computer science
42
512 - Algebra
40
511 - General principles of mathematics
39
615 - Pharmacology & therapeutics
39
100 - Philosophy & psychology
35
520 - Astronomy & allied sciences
35
304 - Factors affecting social behavior
34
410 - Linguistics
34
577 - Ecology
34
320 - Political science
33
363 - Other social problems & services
33
900 - History & geography
32
150 - Psychology
31
331 - Labor economics
31
551 - Geology, hydrology & meteorology
29
617 - Surgery & related medical specialties
29
515 - Analysis
28
580 - Plants (Botany)
27
003 - Systems
25
302 - Social interaction
25
057 - Serials in Slavic languages
24
600 - Technology
23
153 - Mental processes & intelligence
22
400 - Language
21
550 - Earth sciences
20
more ...