Classification
616 - Diseases
396
320 - Political science
227
300 - Social sciences
210
333 - Economics of land & energy
160
330 - Economics
150
621 - Applied physics
149
577 - Ecology
129
620 - Engineering & allied operations
125
551 - Geology, hydrology & meteorology
120
338 - Production
119
005 - Computer programming, programs & data
104
001 - Knowledge
102
004 - Data processing & computer science
98
658 - General management
95
610 - Medicine & health
87
301 - Sociology & anthropology
79
530 - Physics
79
327 - International relations
76
571 - Physiology & related subjects
74
650 - Management & auxiliary services
70
337 - International economics
69
006 - Special computer methods
68
900 - History & geography
68
340 - Law
65
613 - Personal health & safety
65
519 - Probabilities & applied mathematics
63
617 - Surgery & related medical specialties
62
520 - Astronomy & allied sciences
61
614 - Incidence & prevention of disease
60
500 - Natural sciences & mathematics
54
363 - Other social problems & services
52
539 - Modern physics
51
541 - Physical chemistry
51
572 - Biochemistry
51
370 - Education
48
615 - Pharmacology & therapeutics
47
003 - Systems
43
612 - Human physiology
43
580 - Plants (Botany)
40
339 - Macroeconomics & related topics
38
550 - Earth sciences
38
150 - Psychology
37
304 - Factors affecting social behavior
37
306 - Culture & institutions
36
570 - Life sciences; biology
32
332 - Financial economics
31
501 - Philosophy & theory
29
512 - Algebra
29
910 - Geography & travel
29
371 - Schools & their activities; special education
27
more ...