Classification
616 - Diseases
205
333 - Economics of land & energy
72
551 - Geology, hydrology & meteorology
72
519 - Probabilities & applied mathematics
62
621 - Applied physics
61
617 - Surgery & related medical specialties
58
330 - Economics
46
571 - Physiology & related subjects
46
005 - Computer programming, programs & data
44
572 - Biochemistry
44
620 - Engineering & allied operations
44
520 - Astronomy & allied sciences
42
610 - Medicine & health
42
300 - Social sciences
40
070 - News media, journalism & publishing
38
658 - General management
37
530 - Physics
36
004 - Data processing & computer science
34
500 - Natural sciences & mathematics
31
001 - Knowledge
30
006 - Special computer methods
30
541 - Physical chemistry
30
612 - Human physiology
28
910 - Geography & travel
27
515 - Analysis
24
150 - Psychology
23
304 - Factors affecting social behavior
22
510 - Mathematics
22
615 - Pharmacology & therapeutics
20
501 - Philosophy & theory
19
577 - Ecology
19
003 - Systems
18
576 - Genetics & evolution
18
155 - Differential & developmental psychology
15
302 - Social interaction
15
580 - Plants (Botany)
15
614 - Incidence & prevention of disease
15
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
338 - Production
10
570 - Life sciences; biology
10
618 - Gynecology, obstetrics, pediatrics & geriatrics
10
more ...