Classification
616 - Diseases
194
551 - Geology, hydrology & meteorology
73
333 - Economics of land & energy
65
519 - Probabilities & applied mathematics
59
617 - Surgery & related medical specialties
58
006 - Special computer methods
54
621 - Applied physics
54
571 - Physiology & related subjects
51
300 - Social sciences
50
620 - Engineering & allied operations
45
330 - Economics
44
572 - Biochemistry
43
520 - Astronomy & allied sciences
42
001 - Knowledge
41
005 - Computer programming, programs & data
41
610 - Medicine & health
41
070 - News media, journalism & publishing
38
530 - Physics
35
658 - General management
35
541 - Physical chemistry
30
612 - Human physiology
30
003 - Systems
29
004 - Data processing & computer science
28
910 - Geography & travel
27
500 - Natural sciences & mathematics
26
515 - Analysis
24
150 - Psychology
23
304 - Factors affecting social behavior
23
510 - Mathematics
22
501 - Philosophy & theory
20
576 - Genetics & evolution
20
615 - Pharmacology & therapeutics
20
577 - Ecology
19
155 - Differential & developmental psychology
15
580 - Plants (Botany)
15
614 - Incidence & prevention of disease
15
302 - Social interaction
14
590 - Animals (Zoology)
14
512 - Algebra
13
301 - Sociology & anthropology
12
320 - Political science
12
332 - Financial economics
12
900 - History & geography
12
511 - General principles of mathematics
11
531 - Classical mechanics; solid mechanics
11
650 - Management & auxiliary services
11
660 - Chemical engineering
11
613 - Personal health & safety
10
618 - Gynecology, obstetrics, pediatrics & geriatrics
10
539 - Modern physics
9
more ...