Classification
616 - Diseases
396
300 - Social sciences
242
320 - Political science
227
333 - Economics of land & energy
161
330 - Economics
153
621 - Applied physics
151
001 - Knowledge
133
577 - Ecology
132
620 - Engineering & allied operations
129
551 - Geology, hydrology & meteorology
122
338 - Production
113
005 - Computer programming, programs & data
103
004 - Data processing & computer science
99
658 - General management
95
610 - Medicine & health
87
571 - Physiology & related subjects
83
301 - Sociology & anthropology
80
530 - Physics
79
327 - International relations
77
613 - Personal health & safety
71
650 - Management & auxiliary services
70
337 - International economics
69
006 - Special computer methods
68
900 - History & geography
68
340 - Law
65
617 - Surgery & related medical specialties
62
520 - Astronomy & allied sciences
61
519 - Probabilities & applied mathematics
59
614 - Incidence & prevention of disease
57
539 - Modern physics
52
363 - Other social problems & services
50
541 - Physical chemistry
50
370 - Education
49
615 - Pharmacology & therapeutics
49
500 - Natural sciences & mathematics
48
572 - Biochemistry
46
003 - Systems
43
612 - Human physiology
43
580 - Plants (Botany)
41
339 - Macroeconomics & related topics
38
150 - Psychology
37
304 - Factors affecting social behavior
37
550 - Earth sciences
37
306 - Culture & institutions
36
570 - Life sciences; biology
35
332 - Financial economics
31
501 - Philosophy & theory
29
512 - Algebra
29
910 - Geography & travel
29
371 - Schools & their activities; special education
27
more ...