Classification
330 - Economics
646
519 - Probabilities & applied mathematics
303
616 - Diseases
288
006 - Special computer methods
156
570 - Life sciences; biology
129
610 - Medicine & health
125
658 - General management
125
612 - Human physiology
123
571 - Physiology & related subjects
101
300 - Social sciences
95
005 - Computer programming, programs & data
89
530 - Physics
89
333 - Economics of land & energy
79
510 - Mathematics
77
500 - Natural sciences & mathematics
64
620 - Engineering & allied operations
59
004 - Data processing & computer science
57
572 - Biochemistry
57
576 - Genetics & evolution
54
000 - Computer science, information & general works
52
338 - Production
50
700 - The arts; fine & decorative arts
50
332 - Financial economics
45
501 - Philosophy & theory
45
621 - Applied physics
44
615 - Pharmacology & therapeutics
41
512 - Algebra
40
511 - General principles of mathematics
38
001 - Knowledge
35
100 - Philosophy & psychology
35
520 - Astronomy & allied sciences
35
577 - Ecology
35
304 - Factors affecting social behavior
34
410 - Linguistics
34
150 - Psychology
33
320 - Political science
33
363 - Other social problems & services
33
900 - History & geography
32
331 - Labor economics
30
617 - Surgery & related medical specialties
30
551 - Geology, hydrology & meteorology
29
302 - Social interaction
28
515 - Analysis
28
580 - Plants (Botany)
27
600 - Technology
23
153 - Mental processes & intelligence
22
400 - Language
21
550 - Earth sciences
20
401 - Philosophy & theory
19
140 - Specific philosophical schools
18
more ...